@article{IVM_1969_12_a9,
     author = {A. M. Panov},
     title = {On the theory of the index of systems of difference equations on the plane},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {71--75},
     publisher = {mathdoc},
     number = {12},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_12_a9/}
}