@article{DE_1981_17_11_a12,
     author = {A. G. Kuz'min},
     title = {On the behavior of the characteristics of equations of mixed type near the line of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2052--2063},
     publisher = {mathdoc},
     volume = {17},
     number = {11},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_11_a12/}
}