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@article{IVM_1974_8_a14, author = {A. A. Potapenko}, title = {Semi-invariance of linear differential equations}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {89--94}, publisher = {mathdoc}, number = {8}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1974_8_a14/} }
A. A. Potapenko. Semi-invariance of linear differential equations. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1974), pp. 89-94. http://geodesic.mathdoc.fr/item/IVM_1974_8_a14/