1. O. G. Pavlenko, Radiotekh. Elektron. (Moscow) 19, 743 (1974).
2. W. G. Cady, Piezoelectricity (McGraw-Hill, New York, 1946; Inostrannaya Literatura, Moscow, 1949).
3. I. V. Il’in and A. V. Kharitonov, Defektoskopiya, No. 7, 86 (1960).
4. V. V. Furduev, Reciprocity Theorems (Gostekhteorizdat, Moscow, 1948) [in Russian].
5. A. A. Kharkevich, Theory of Electro-Acoustic Transducers. Wave Processes (Nauka, Moscow, 1973) [in Russian].