@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/}
}