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In Memoriam
| Prof. dr Stefan CZARNECKI | |
| Editorial Committe and Board | 171-172 |
Research Papers
| A geometrical-numerical method for the determination of the acoustic field properties related to the directions of reflected waves | |
| Maria TAJCHERT | 173-182 |
| A method for determining the equivalent level of noise generated by a system of sources in an enclosure | |
| Rufin MAKAREWICZ, Gabriela KERBER | 183-196 |
| Application of an automatic audiometer in the measurement of the directional characteristic of hearing | |
| Jan ŻERA, Tomira BOEHM, Tomasz ŁĘTOWSKI | 197-206 |
| Fundamental aspects of aeroacoustics in singing | |
| Zygmunt PAWŁOWSKI, Marek ŻÓŁTOWSKI | 207-224 |
| Dynamic ultrasonic visualization of blood vessels and flows | |
| Andrzej NOWICKI, John M. REID | 225-246 |
| Application of the stationary echo cancellation technique (SEC) in ultrasonic doppler measurements of blood flow in children's hearts | |
| L. FILIPCZYŃSKI, A. NOWICKI, A. CHROŚCICKI | 247-252 |
| Detectability of blood vessels by means of the ultrasonic echo method using a focused ultrasonic beam | |
| Leszek FILIPCZYŃSKI | 253-270 |
| Acoustooptic conversion of te and tm modes in a diffusive planar waveguide | |
| Mieczysław SZUSTAKOWSKI, Bogusław ŚWIETLICKI | 271-301 |
| An improved piezoelectric ceramic transducer for ultrasonic applications in air | |
| V. N. BINDAL, Mukesh CHANDRA | 281-286 |
Chronicle
| XXVIII Open Seminar on Acoustics Gliwice, 7–11 September, 1981 | |
| H. RYFFERT | 287-292 |