#### Table of contents

Bulg. J. Phys. vol. **20** no. 3-4 (1993)

**Algebraic Solution for Specific Potentials on the Poincare Upper Half-Plane**

L. Chetouani, L. Guechi, T.F. Hammann

pp. 001-010, [abs, pdf]

**Radiative β-Transition In**

^{198}Au RadionuclideA.M. Basha, H.S.A. Ragab, S. El-Konsol, E.I. Khalil, O.M. Osman

pp. 011-017, [abs, pdf]

**Short-Range Correlations and the**

*A*-Representability Problem within the Low-Order Approximation to the Jastrow MethodM.V. Stoitsov, A.N. Antonov, S.S. Dimitrova

pp. 018-024, [abs, pdf]

**Transformations of the Equilibrium Orbit in Synchrotrons During Injection and Extraction**

D. Dinev

pp. 025-031, [abs, pdf]

**Radiation Risk for the Electronic Blocks of the Electrostatic Probes for the Mars'94 Experiment**

B. Kirov, K. Georgieva

pp. 032-038, [abs, pdf]

**Nitrogen Ions Implantation In Al-4 wt% Cu Alloy**

V. Dimova, G. Zlateva, V. Gaidarova, T. Markov, D. Danailov, Ch. Angelov

pp. 039-045, [abs, pdf]

**Spectrophotopolarimeter: A Simplified Version for Real Time Measurement at Selected Wavelengths**

L. Nikolova, M. Ivanov, T.Todorov, S. Stoyanov

pp. 046-054, [abs, pdf]

**Single-Channel Amplitude Analyzer with Exact Timing**

S. Ormandjiev, V. Angelov, M. Makahleh

pp. 055-064, [abs, pdf]

**Soil Moisture Estimates with Multifrequency Radar Systems**

N. Zerdev, G.P. Kulemin

pp. 065-070, [abs, pdf]

**Loss Analysis in the Discharge Loop of a High-Power Artificial Line Pulsed Modulator**

N.I. Mihailov, O.I. Vankov, Ch.G. Ghelev

pp. 071-075, [abs, pdf]