@article{IVM_1958_3_a15,
     author = {V. V. Leonov},
     title = {The problem of constructing a~fundamental solution of a~system of linear differential equations near an irregular singular point},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {123--141},
     publisher = {mathdoc},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1958_3_a15/}
}