@article{DE_1982_18_2_a14,
     author = {A. I. Ibragimov},
     title = {On some qualitative properties of solutions of second-order equations of parabolic type with continuous coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {306--319},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_2_a14/}
}