@article{DAN_1961_138_5_a4,
     author = {S. N. Kruzhkov},
     title = {An a priori estimate of the solutions of linear parabolic equations and solutions of boundary-value problems},
     journal = {Doklady Akademii Nauk},
     pages = {1005--1008},
     year = {1961},
     volume = {138},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_5_a4/}
}