@article{IVM_1990_6_a7,
     author = {I. V. Mel'nikova and A. I. Filinkov},
     title = {Classification with respect to boundary value problems of a~complete second-order equation in {a~Banach} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--45},
     year = {1990},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1990_6_a7/}
}