ZÁPLATA, F.; KASAL, M. Software defined DCF77 receiver. Radioengineering, 2013, vol. 2013, no. 4, p. 1211-1217. ISSN: 1210- 2512.

KASEM, E.; MARŠÁLEK, R.; BLUMENSTEIN, J. Performance of LTE advanced uplink in a Flat Rayleigh channel. Advances in Electrical and Electronic Engineering, 2013, vol. 11, no. 4, p. 266-274. ISSN: 1336- 1376.

POMĚNKOVÁ, J. The Endogeneity of Optimum Currency Area Criteria in the Context of Financial Crisis: Evidence from Time- Frequency Domain Analysis. Agricultural Economics (AGRICECON), 2013, vol. 58, no. 9, p. 389-395. ISSN: 0139- 570X.

ŠTUMPF, M.; VANDENBOSCH, G. On the Limitations of the Time- Domain Impedance Boundary Condition. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 2013, vol. 61, no. 12, p. 1-6. ISSN: 0018- 926X.

ŠTUMPF, M.; NILSSON, B. Pulsed acoustic field radiation in a laterally bounded layered fluid. JOURNAL OF ENGINEERING MATHEMATICS, 2013, vol. 1, no. 1, p. 1-11. ISSN: 0022- 0833.

MRÁZ, L.; CERVENKA, V.; ŠIMEK, M.; KOMOSNÝ, D. Comprehensive Performance Analysis of ZigBee Technology Based on Real Measurements. WIRELESS PERSONAL COMMUNICATIONS, 2013, vol. 2013, no. 71/ 4, p. 2783-2803. ISSN: 0929- 6212.

MARTINÁSEK, Z.; ZEMAN, V. Innovative Method of the Power Analysis. Radioengineering, 2013, vol. 22, no. 02, p. 586-594. ISSN: 1210- 2512.

HILLOVÁ MANNOVÁ, J.; ŠILHART, Z.; ŠEVČÍK, P.; PROKEŠ, A. Perioperative haemodynamic monitoring by oesophageal Doppler improves outcome of patients with abdominal aortic aneurysm repair. Bratislavske lekárske listy, 2013, vol. 114, no. 2, p. 78-83. ISSN: 0006- 9248.

MERLOS RODRIGO, M.; CERNEI, N.; KOMÍNKOVÁ, M.; ZÍTKA, O.; BEKLOVÁ, M.; ZEHNÁLEK, J.; KIZEK, R.; ADAM, V. Ion exchange chromatography and mass spectrometric methods for analysis of cadmium-phytochelatin (II) complexes. International Journal of Environmental Research and Public Health, 2013, vol. 10, no. 4, p. 1304-1311. ISSN: 1660- 4601.

CHUDOBOVÁ, D.; ČÍHALOVÁ, K.; RUTTKAY-NEDECKÝ, B.; MERLOS RODRIGO, M.; TMEJOVÁ K.; KOPEL, P.; NEJDL, L.; KUDR, J.; GUMULEC, J.; KŘÍŽKOVÁ, S.; KYNICKÝ, J.; KIZEK, R.; ADAM, V. Comparison of the effects of silver phosphate and selenium nanoparticles on Staphylococcus aureus growth reveals potential for selenium particles to prevent infection. FEMS Microbiology Letters, 2013, vol. 351, no. 2, p. 195-201. ISSN: 0378- 1097.

STARKOV, A.; STARKOV, I. An analytical approach for scanning probe microscope- tip electrostatic field distribution accounting for dead layer and domain wall. IEEE Transactions on Ultrasonocs, Ferroelectrics, and Frequency Control, 2013, vol. 60, no. 12, p. 2465-2470. ISSN: 0885- 3010.

BOLEČEK, L.; ŘÍČNÝ, V.; KALLER, O. Statistical analysis of subjective tests results of the various 3D displays. Slaboproudý obzor, 2013, vol. 69, no. 4, p. 9-15. ISSN: 0037- 668X.

BIOLEK, D.; DI VENTRA, M.; PERSHIN, Y. Reliable SPICE Simulations of Memristors, Memcapacitors and Meminductors. Radioengineering, 2013, vol. 22, no. 4, p. 945-968. ISSN: 1210- 2512.

STARKOV, I.; STARKOV, A. On the thermodynamic foundations of solid-state cooler based on multiferroic materials On the thermodynamic foundations of solid-state cooler based on multiferroic materials On the thermodynamic foundations of solid- state cooler based on multiferroic materials. INTERNATIONAL JOURNAL OF REFRIGERATION- REVUE INTERNATIONALE DU FROID, 2013, vol. NA, no. NA, p. 1-8. ISSN: 0140- 7007.

ATASSI, H.; FAROOQ, K.; HUSSAIN, A. A Novel Clinical Expert System for Chest Pain Risk Assessment. Lecture Notes in Computer Science, 2013, vol. 2013, no. 7888, p. 296-307. ISSN: 0302- 9743.

GREJTÁK, F.; PROKEŠ, A. UWB- Ultrawideband characteristics and the Saleh Valenzuela modeling. Acta Electrotechnica et Informatica, 2013, vol. 13, no. 2, p. 33-38. ISSN: 1335- 8243.

MONTERO, P.; POLÁK, L.; TAIBO, J.; KRATOCHVÍL, T. Subjective Quality Assessment of the Impact of Buffer Size in Fine- Grain Parallel Video Encoding. Radioengineering, 2012, vol. 21, no. 4, p. 1226-1235. ISSN: 1210- 2512.

JANEČEK, M.; KUBÁNEK, D.; VRBA, K. Voltage-Controlled Square/ Triangular Wave Generator with Current Conveyors and Switching Diodes. International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems, 2012, vol. 1, no. 2- 3, p. 1-4. ISSN: 1805- 5443.

KHATEB, F.; JAIKLA, W.; KUBÁNEK, D.; KHATIB, N. Electronically tunable voltage- mode quadrature oscillator based on high performance CCCDBA. ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, 2012, vol. 74, no. 3, IF: 0. 592, p. 499-505. ISSN: 0925- 1030.

KUFA, M.; RAIDA, Z. Comparison of planar fractal filters on defected ground substrate. Radioengineering, 2012, vol. 21, no. 4, p. 1-7. ISSN: 1210- 2512.

RAIDA, Z.; KOLKA, Z.; MARŠÁLEK, R.; PETRŽELA, J.; PROKEŠ, A.; ŠEBESTA, J.; GÖTTHANS, T.; HRUBOŠ, Z.; KINCL, Z.; KLOZAR, L.; POVALAČ, A.; ŠOTNER, R.; KADLEC, P. Communication subsystems for emerging wireless technologies. Radioengineering, 2012, vol. 21, no. 4, p. 1-14. ISSN: 1210- 2512.

POVALAČ, A.; WITRISAL, K.; ŠEBESTA, J. Degenerate RFID Channel Modeling for Positioning Applications. Radioengineering, 2012, vol. 21, no. 4, p. 1163-1170. ISSN: 1210- 2512.

ŠINDLER, P.; POKORNÝ, M. Retrodirective Antenna Array Using High Frequency Offset. Radioengineering, 2012, vol. 2012, no. 4, p. 1-6. ISSN: 1210- 2512.

SIGMUND, M. Influence of Psychological Stress on Formant Structure of Vowels. Elektronika Ir Elektrotechnika, 2012, vol. 2012 (18), no. 10, p. 45-48. ISSN: 1392- 1215.

GÖTTHANS, T.; PETRŽELA, J. Analysis and implementation of dynamical system with periodical discrete jumps. Przeglad Elektrotechniczny, 2012, vol. 2012, no. 4, p. 161-167. ISSN: 0033- 2097.

HERENCSÁR, N.; KOTON, J.; LAHIRI, A.; METIN, B.; VRBA, K. A Voltage Gain-Controlled Modified CFOA And Its Application in Electronically Tunable Four-Mode All- Pass Filter Design. International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems, 2012, vol. 1, no. 1, p. 20-25. ISSN: 1805- 5443.

HU, H.; MÜNSTER, P.; PALUSHANI, E.; GALILI, M.; MULVAD, H.C.H.; JEPPESEN, P.; OXENLOWE, L. 640 Gbaud Phase-Correlated OTDM NRZ- OOK Generation and Field Trial Transmission. JOURNAL OF LIGHTWAVE TECHNOLOGY, 2012, vol. 30, no. 99, p. 1-7. ISSN: 0733- 8724.

GRILL, R.; FRANC, J.; ELHADIDY, H.; BELAS, E.; UXA, Š.; BUGÁR, M.; MORAVEC, P.; HÖSCHL, P. Theory of Deep Level Spectroscopy in Semi- Insulating CdTe. IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 2012, vol. 59, no. 5, p. 2383-2391. ISSN: 0018- 9499.

BLUMENSTEIN, J.; ŠIMKO, M.; MARŠÁLEK, R.; FEDRA, Z.; PROKOPEC, J.; RUPP, M. Two Dimensional Signal Spreading in UMTS LTE: Exploiting Time- Frequency Diversity to Increase Throughput. WIRELESS PERSONAL COMMUNICATIONS, 2012, vol. 2012, no. 68, p. 1-11. ISSN: 0929- 6212.

MIŠUREC, J.; KOTON, J. Schmitt Trigger with Controllable Hysteresis Using Current Conveyors. International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems, 2012, vol. 1, no. 1, p. 26-30. ISSN: 1805- 5443.

KHATEB, F.; HORSKÝ, P.; FUJCIK, L.; VRBA, R.; PAVLÍK, M. Comment on "High performance low-voltage QFG-based DVCC and a novel fully differential SC integrator based on it". IEICE Electronics Express, 2012, vol. 2012 (9), no. 18, IF: 0. 461, p. 1492-1493. ISSN: 1349- 2543.

LAHIRI, A.; HERENCSÁR, N. CMOS-based active RC sinusoidal oscillator with four-phase quadrature outputs and single-resistance-controlled (SRC) tuning laws. AEU - International Journal of Electronics and Communications, 2012, vol. 66, no. 12, p. 1032-1037. ISSN: 1434- 8411.

POMĚNKOVÁ, J.; MARŠÁLEK, R. Time and frequency domain in the business cycle structure. Agricultural Economics (AGRICECON), 2012, vol. 2012, no. 7, p. 332-346. ISSN: 0139- 570X.

ARSLAN, E.; METIN, B.; HERENCSÁR, N.; KOTON, J.; MORGÜL, A.; CICEKOGLU, O. High Performance Wideband CMOS CCI and its Application in Inductance Simulator Design. ADV ELECTR COMPUT EN, 2012, vol. 12, no. 3, p. 21-26. ISSN: 1582- 7445.

LÁČÍK, J. Circularly Polarized SIW Square Ring-Slot Antenna for X- Band Applications. Microwave and Optical Technology Letters, 2012, vol. 54, no. 11, p. 2590-2594. ISSN: 0895- 2477.

KHATEB, F.; KAÇAR, F.; KHATIB, N.; KUBÁNEK, D. High-precision Differential-Input Buffered and External Transconductance Amplifier for Low-voltage Low- power Applications. CIRCUITS SYSTEMS AND SIGNAL PROCESSING, 2012, vol. 2012 (31), no. 4, IF: 0. 817, p. 1-24. ISSN: 0278- 081X.

FAÚNDEZ ZANUY, M.; HUSSAIN, A.; MEKYSKA, J.; SESA-NOGUERAS, E.; MONTE-MORENO, E.; ESPOSITO, A.; CHETOUANI, M.; GARRE-OLMO, J.; ABEL, A.; SMÉKAL, Z.; LOPEZ-DE-IPINA, K. Biometric Applications Related to Human Beings: There Is Life beyond Security. Cognitive Computation, 2012, vol. 4, no. 2, p. 1-16. ISSN: 1866- 9956.

ESPINOSA-DURÓ, V.; FAÚNDEZ ZANUY, M.; MEKYSKA, J. A New Face Database Simultaneously Acquired in Visible, Near- Infrared and Thermal Spectrums. Cognitive Computation, 2012, vol. 4, no. 2, p. 1-17. ISSN: 1866- 9956.

TOMÁNEK, P.; ŠKARVADA, P.; GRMELA, L.; MACKŮ, R.; SMITH, S. Local investigation of defects in monocrystalline silicon solar cells. Conference Record of the IEEE Photovoltaic Specialists Conference, 2012, vol. 2012, no. 1, p. 1686-1690. ISSN: 0160- 8371.

ZELINKA, P.; SIGMUND, M.; SCHIMMEL, J. Impact of vocal effort variability on automatic speech recognition. Speech Communication, 2012, vol. 54, no. 6, p. 732-742. ISSN: 0167- 6393.

KOMOSNÝ, D.; BALEJ, J.; ŠIMEK, M.; DOLEŽEL, P.; SATHU, H.; SHUKLA, R. Cable Length Based Geolocalisation. Przeglad Elektrotechniczny, 2012, vol. 2012, no. 7a, p. 26-32. ISSN: 0033- 2097.

KOVÁCS, P.; RAIDA, Z. Design and Optimization of High- Impedance Surfaces. INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER- AIDED ENGINEERING, 2012, vol. 2012 (22), no. 4, p. 541-544. ISSN: 1096- 4290.

KOLÁŘOVÁ, E.; BRANČÍK, L. Application of Stochastic Differential Equations in Second- Order Electrical Circuits Analysis. Przeglad Elektrotechniczny, 2012, vol. 2012, no. 7a, p. 103-107. ISSN: 0033- 2097.

SEDLÁKOVÁ, V.; MAJZNER, J.; SEDLÁK, P.; KOPECKÝ, M.; ŠIKULA, J.; SANTO-ZARNIK, M.; BELAVIC, D.; HROVAT, M. Evaluation of piezoresistive ceramic pressure sensors using noise measurements. Informacije MIDEM, 2012, vol. 42, no. 2, p. 109-114. ISSN: 0352- 9045.

ŠOTNER, R.; LAHIRI, A.; JEŘÁBEK, J.; HERENCSÁR, N.; KOTON, J.; DOSTÁL, T.; VRBA, K. Special Type of Three- Phase Oscillator Using Current Gain Control for Amplitude Stabilization. International Journal of Physical Sciences, 2012, vol. 7, no. 25, p. 3089-3098. ISSN: 1992- 1950.

LEKOMTCEV, D.; MARŠÁLEK, R. Comparison of 802.11af and 802.22 standards – physical layer and cognitive functionality. Elektrorevue - Internetový časopis (http://www.elektrorevue.cz), 2012, vol. 2012, no. 2, p. 12-18. ISSN: 1213- 1539.

METIN, B.; HERENCSÁR, N.; VRBA, K. A CMOS DCCII with a Grounded Capacitor Based Cascadable All- Pass Filter Application. Radioengineering, 2012, vol. 21, no. 2, p. 718-724. ISSN: 1210- 2512.

KHATEB, F.; KHATIB, N.; KUBÁNEK, D. Low-voltage Ultra-Low-Power Current Conveyor Based on Quasi- Floating Gate Transistors. Radioengineering, 2012, vol. 2012 (21), no. 2, IF: 0. 739, p. 725-735. ISSN: 1210- 2512.

SESA-NOGUERAS, E.; FAÚNDEZ ZANUY, M.; MEKYSKA, J. An Information Analysis of In-Air and On- Surface Trajectories in Online Handwriting. Cognitive Computation, 2012, vol. 4, no. 2, p. 195-205. ISSN: 1866- 9956.

KAPOUNEK, S.; POMĚNKOVÁ, J. Liquidity supply and money velocity co-movements in the Eurozone – Time- Frequency Domain Approach. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2012, vol. 2012 (LX), no. 2, p. 109-116. ISSN: 1211- 8516.

SMÉKAL, Z.; ŠMIRG, O.; LIBERDA, O.; ŠPRLÁKOVÁ, A. MRI Slice Segmentation and 3D Modelling of Temporomandibular Joint Measured by Microscopic Coil. Measurement Science Review, 2012, vol. 2012, no. 3, p. 74-81. ISSN: 1335- 8871.

SEDLÁK, P.; ŠIKULA, J.; MAJZNER, J.; VRŇATA, M.; FITL, P.; KOPECKÝ, D.; VYSLOUŽIL, F.; HANDEL, P. Adsorption– desorption noise in QCM gas sensors. Sensors and Actuators B: Chemical, 2012, vol. 166- 167, no. 1, p. 264-268. ISSN: 0925- 4005.

MORÁVEK, P.; KOMOSNÝ, D.; ŠIMEK, M. Multilateration and Flip Ambiguity Mitigation in Ad- hoc Networks. Przeglad Elektrotechniczny, 2012, vol. 2012, no. 05b, p. 91-98. ISSN: 0033- 2097.

KNÁPEK, A.; GRMELA, L.; ŠIKULA, J.; ŠIK, O. Cold field- emission cathode noise analysis. METROL MEAS SYST, 2012, vol. 2012, no. 2, p. 417-422. ISSN: 0860- 8229.

HASMANDA, M.; ŘÍHA, K. The Modelling of Stereoscopic 3D Scene Acquisition. Radioengineering, 2012, vol. 21, no. 1, p. 134-142. ISSN: 1210- 2512.

SEDLÁK, P.; MAJZNER, J.; ŠIKULA, J.; HÁJEK, K. Noise measurement setup for quartz crystal microbalance. Radioengineering, 2012, vol. 21, no. 1, p. 207-212. ISSN: 1210- 2512.

ŠPAČEK, J.; KASAL, M. The Model of the Low Rate Telemetry Communication System for Matlab- Simulink. Radioengineering, 2012, vol. 2012(21), no. 2, p. 666-672. ISSN: 1210- 2512.

HERENCSÁR, N.; LAHIRI, A.; VRBA, K.; KOTON, J. An electronically tunable current- mode quadrature oscillator using PCAs. INTERNATIONAL JOURNAL OF ELECTRONICS, 2012, vol. 99, no. 5, p. 609-621. ISSN: 0020- 7217.

IBRAHIM, M.; MINAEI, S.; YUCE, E.; HERENCSÁR, N.; KOTON, J. Lossy/Lossless Floating/ Grounded Inductance Simulation Using One DDCC. Radioengineering, 2012, vol. 21, no. 1, p. 3-10. ISSN: 1210- 2512.

MLÝNEK, P.; KOUTNÝ, M.; MIŠUREC, J.; ŠILHAVÝ, P. Two- port Network Transfer Function for Power Line Topology Modeling. Radioengineering, 2012, vol. 21, no. 1, p. 356-363. ISSN: 1210- 2512.

POLÁK, L.; KRATOCHVÍL, T. Analysis and Simulation of the Transmission Distortions of the Mobile Digital Television DVB-SH Part 2: Satellite mode DVB-SH- B with TDM. Radioengineering, 2012, vol. 21, no. 1, p. 126-133. ISSN: 1210- 2512.

ŠIMEK, M.; MORÁVEK, P.; KOMOSNÝ, D.; DUSÍK, M. Distributed Recognition of Reference Nodes for Wireless Sensor Network Localization. Radioengineering, 2012, vol. 21, no. 1, p. 89- 98 (121 p.)ISSN: 1210- 2512.

AYTEN, U.; SAGBAS, M.; HERENCSÁR, N.; KOTON, J. Novel Floating General Element Simulators Using CBTA. Radioengineering, 2012, vol. 21, no. 1, p. 11-19. ISSN: 1210- 2512.

HERENCSÁR, N.; LAHIRI, A.; KOTON, J.; VRBA, K.; METIN, B. Realization of Resistorless Lossless Positive and Negative Grounded Inductor Simulators Using Single ZC- CCCITA. Radioengineering, 2012, vol. 21, no. 1, p. 264-272. ISSN: 1210- 2512.

VÁGNER, P.; URBANEC, T.; KASAL, M. Band- monitoring Payload for a CubeSat Satellite. Radioengineering, 2012, vol. 21, no. 1, p. 430-435. ISSN: 1210- 2512.

FRÝZA, T.; SVOBODOVÁ, J.; ADAMEC, F.; MARŠÁLEK, R.; PROKOPEC, J. Overview of Parallel Platforms for Common High Performance Computing. Radioengineering, 2012, vol. 21, no. 1, p. 436-444. ISSN: 1210- 2512.

DOBEŠ, J.; BIOLKOVÁ, V. Reliable and Efficient Procedure for Steady- State Analysis of Nonautonomous and Autonomous Systems. Radioengineering, 2012, vol. 21, no. 1, p. 374-385. ISSN: 1210- 2512.

PETRŽELA, J. Optimal piecewise- linear approximation of the quadratic chaotic dynamics. Radioengineering, 2012, vol. 21, no. 1, p. 20-28. ISSN: 1210- 2512.

FEDRA, Z.; DIMITRIJEVIC, B.; MILOSEVIC, N.; NIKOLIC, Z.; ANTIC, D. Variance based OFDM frame synchronization. Radioengineering, 2012, vol. 21, no. 1, p. 408-413. ISSN: 1210- 2512.

BIOLEK, D.; BIOLKOVÁ, V.; KOLKA, Z. Immediate Analysis of Periodic Steady States in Switched DC- DC Converters via SPICE. Radioengineering, 2012, vol. 21, no. 1, p. 386-391. ISSN: 1210- 2512.

KUBÍČEK, M.; KOLKA, Z. In- system Jitter Measurement Based on Blind Oversampling Data Recovery. Radioengineering, 2012, vol. 2012, no. 1, p. 403-407. ISSN: 1210- 2512.

ŠOTNER, R.; JEŘÁBEK, J.; HERENCSÁR, N.; HRUBOŠ, Z.; DOSTÁL, T.; VRBA, K. Study of Adjustable Gains for Control of Oscillation Frequency and Oscillation Condition in 3R- 2C Oscillator. Radioengineering, 2012, vol. 21, no. 1, p. 392-402. ISSN: 1210- 2512.

HERENCSÁR, N.; VRBA, K.; KOTON, J. A Novel Current-Mode KHN- Equivalent Biquad Using Three CFTAs. Journal of Active and Passive Electronic Devices, 2012, vol. 7, no. 3, p. 201-208. ISSN: 1555- 0281.

SLANINA, M.; KRATOCHVÍL, T.; POLÁK, L.; ŘÍČNÝ, V. Analysis of Temporal Effects in Quality Assessment of High Definition Video. Radioengineering, 2012, vol. 21, no. 1, p. 63-69. ISSN: 1210- 2512.

KOVÁCS, P.; URBANEC, T. Electromagnetic Band Gap Structures: Practical Tips and Advice for Antenna Engineers. Radioengineering, 2012, vol. 21, no. 1, p. 414-421. ISSN: 1210- 2512.

SLANINA, M.; KRATOCHVÍL, T.; BOLEČEK, L.; ŘÍČNÝ, V.; KALLER, O.; POLÁK, L. Testing QoE in Different 3D HDTV Technologies. Radioengineering, 2012, vol. 21, no. 1, p. 445-454. ISSN: 1210- 2512.

SCHIMMEL, J. Audible Aliasing Distortion in Digital Audio Synthesis. Radioengineering, 2012, vol. 21, no. 1, p. 56-62. ISSN: 1210- 2512.

SYSEL, P.; RAJMIC, P. Goertzel Algorithm Generalized to Non- integer Multiples of Fundamental Frequency. EURASIP Journal on Advances in Signal Processing, 2012, vol. 2012, no. 56, p. 1-20. ISSN: 1687- 6172.

SEDLÁKOVÁ, V.; ŠIKULA, J.; CHVÁTAL, M.; PAVELKA, J.; TACANO, M.; TOITA, M. Noise in Submicron Metal-Oxide-Semiconductor Field Effect Transistors: Lateral Electron Density Distribution and Active Trap Position. Japanese Journal of Applied Physics, 2012, vol. 2012 (51), no. 1, p. 024105- 1 (024105-5 p.)ISSN: 0021- 4922.

GRMELA, L.; ŠKARVADA, P.; TOMÁNEK, P.; MACKŮ, R.; SMITH, S. Thermal dependence of light emission from reverse- biased monocrystalline silicon solar cells. SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2012, vol. 96, no. 1, p. 108-111. ISSN: 0927- 0248.

HERENCSÁR, N.; KOTON, J.; VRBA, K.; LATTENBERG, I. Voltage-Controlled Current- Mode Multifunction Filter Employing CFTAs and PCAs. Journal of Active and Passive Electronic Devices, 2012, vol. 7, no. 1- 2, p. 61-69. ISSN: 1555- 0281.