@article{DE_1986_22_8_a11,
     author = {L. I. Kamynin and B. N. Khimchenko},
     title = {A theorem on the interior derivative for an elliptic-parabolic equation of {Kolmogorov} type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1400--1409},
     publisher = {mathdoc},
     volume = {22},
     number = {8},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_8_a11/}
}