This article was published in 1971 in the Russian journal S c i e n c e a n d L i f e . Teachers and students who read our Journal can profit from the advice of this master theoretician. We are grateful to E. M. Lifshitz and the editor of S c i e n c e a n d L i f e for permission to publish the article and particularly to J. George Adashko for preparing the translation.
The American Journal of Physics – American Association of Physics Teachers
Published: May 1, 1977
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