The correct formulation of boundary value problems for parabolic equations with a characteristic form of variable sign
Differencialʹnye uravneniâ, Tome 9 (1973) no. 1, pp. 130-135.

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     author = {A. M. Nakhushev},
     title = {The correct formulation of boundary value problems for parabolic equations with a characteristic form of variable sign},
     journal = {Differencialʹnye uravneni\^a},
     pages = {130--135},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_1_a13/}
}
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A. M. Nakhushev. The correct formulation of boundary value problems for parabolic equations with a characteristic form of variable sign. Differencialʹnye uravneniâ, Tome 9 (1973) no. 1, pp. 130-135. http://geodesic.mathdoc.fr/item/DE_1973_9_1_a13/