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@article{Kaganov:1985, author = {M. I. Kaganov}, title = {Encyclopedia of theoretical physics}, publisher = {Physics-Uspekhi}, year = {1985}, journal = {Phys. Usp.}, volume = {28}, number = {2}, pages = {209-212}, url = {https://ufn.ru/en/articles/1985/2/h/}, doi = {10.1070/PU1985v028n02ABEH003857} }
Оригинал: Каганов М И «Энциклопедия теоретической физики» УФН 145 349–354 (1985); DOI: 10.3367/UFNr.0145.198502g.0349