5th Edition . - M. —L. : State Publishing House of Technical and Theoretical Literature, 1950. — 368 s. The book is a great guide to mathematical physics, in which , On the other hand, , The classical works on mathematical physics of the first half of the 19th century are very fully described. and on the other hand, much attention is paid to the applications of mathematical physics methods to specific, Practically important technical tasks . Among these tasks, the central place is occupied by forced oscillations of elastic systems and, in particular, the phenomenon of resonance.