@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/}
}