@article{DAN_1969_184_5_a1,
     author = {S. D. \`Eidel'man and V. A. Kondratiev},
     title = {Certain properties of the positive solutions of evolutionary hypoelliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1027--1030},
     publisher = {mathdoc},
     volume = {184},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_5_a1/}
}