RYFFERT H. XXVIII Open Seminar on Acoustics Gliwice, 7–11 September, 1981. Arch. Acoust. [Internet]. 1982 Dec. 31 [cited 2026 Mar. 1];7(3-4):287-92. Available from: https://acoustics.ippt.pan.pl/index.php/aa/article/view/3289