@article{IIGUM_2015_11_a1,
     author = {N. D. Bang and V. F. Chistyakov and E. V. Chistyakova},
     title = {About some properties of degenerate systems of linear integro-differential {equations.~I}},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {13--27},
     publisher = {mathdoc},
     volume = {11},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2015_11_a1/}
}