@article{DE_1981_17_11_a1,
     author = {I. M. Burkin and L. I. Burkina and G. A. Leonov},
     title = {Barbashin's problem in the theory of phase systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1932--1944},
     publisher = {mathdoc},
     volume = {17},
     number = {11},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_11_a1/}
}