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@article{DE_1978_14_10_a20, author = {I. A. Toroshelidze}, title = {A theorem of {G.} {J.} {Butler}}, journal = {Differencialʹnye uravneni\^a}, pages = {1903--1904}, publisher = {mathdoc}, volume = {14}, number = {10}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1978_14_10_a20/} }
I. A. Toroshelidze. A theorem of G. J. Butler. Differencialʹnye uravneniâ, Tome 14 (1978) no. 10, pp. 1903-1904. http://geodesic.mathdoc.fr/item/DE_1978_14_10_a20/