@article{DAN_1963_151_2_a5,
     author = {T. G. Genchev},
     title = {On ultraparabolic equations},
     journal = {Doklady Akademii Nauk},
     pages = {265--268},
     publisher = {mathdoc},
     volume = {151},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_2_a5/}
}