@article{DAN_1983_273_1_a7,
     author = {G. I. Kresin and V. G. Maz'ya},
     title = {The maximum principle for second-order elliptic and parabolic},
     journal = {Doklady Akademii Nauk},
     pages = {38--41},
     publisher = {mathdoc},
     volume = {273},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_1_a7/}
}