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%0 Journal Article %T Encyclopedia of theoretical physics %A M. I. Kaganov %I Physics-Uspekhi %D 1985 %J Phys. Usp. %V 28 %N 2 %P 209-212 %U https://ufn.ru/en/articles/1985/2/h/ %U https://doi.org/10.1070/PU1985v028n02ABEH003857
Оригинал: Каганов М И «Энциклопедия теоретической физики» УФН 145 349–354 (1985); DOI: 10.3367/UFNr.0145.198502g.0349