1. H. Kutruff, Room Acoustics (Spon Press, New York, 2000).
2. Yu. I. Bobrovnitskii, Akust. Zh. 50, 751 (2004) [Acoust. Phys. 50, 647 (2004)].
3. C. A. Brebbia, J. C. F. Telles, and L. C. Wrobel, Boundary Element Techniques: Theory and Appiications in Engineering (Springer, Berlin, 1984; Mir, Moscow, 1987).
4. V. M. Babich and V. S. Buldyrev, Asymptotic Methods in Short Wave Diffraction Problems (Nauka, Moscow, 1972) [in Russian].
5. L. A. Vainshtein, Open Resonators and Open Waveguides (Sov. Radio, Moscow, 1966) [in Russian].