@article{IVM_1999_11_a5,
     author = {V. S. Mokeichev and A. V. Mokeichev},
     title = {A~new approach to the theory of linear problems for systems of partial differential {equations.~III}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--59},
     year = {1999},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1999_11_a5/}
}