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2. C. I. Marchuk and V. I. Agoshkov, Introduction to Projection-Grid Methods [in Russian], Nauka, Moscow (1981).
3. C. A. Brebbia, The Boundary Element Method for Engineerings, Pentech Press, London (1978).
4. P. Benerdji and R. Batterfield, Boundary-Element Method in Applied Sciences [Russian translation], Mir, Moscow (1984).
5. C. A. Brebbia and S. Walker, Introduction to boundary element methods, Proceedings of the first International Seminar on Recent Advances in Boundary Element Methods, Southhampton University, July 1978, Pentech Press (1978) pp. 1?43.