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@article{DE_1990_26_4_a18, author = {S. S. Titov}, title = {Analyticity of linear one-parameter {Lie--B\"acklund} groups}, journal = {Differencialʹnye uravneni\^a}, pages = {699--702}, publisher = {mathdoc}, volume = {26}, number = {4}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a18/} }
S. S. Titov. Analyticity of linear one-parameter Lie--B\"acklund groups. Differencialʹnye uravneniâ, Tome 26 (1990) no. 4, pp. 699-702. http://geodesic.mathdoc.fr/item/DE_1990_26_4_a18/