@article{DE_1969_5_1_a14,
     author = {Pham Ngoc Thao},
     title = {Natural differential operators on compact manifolds},
     journal = {Differencialʹnye uravneni\^a},
     pages = {186--198},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_1_a14/}
}