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@article{DAN_1960_134_6_a1, author = {L. R. Volevich}, title = {A class of hypoelliptic systems}, journal = {Doklady Akademii Nauk}, pages = {1275--1278}, publisher = {mathdoc}, volume = {134}, number = {6}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_6_a1/} }
L. R. Volevich. A class of hypoelliptic systems. Doklady Akademii Nauk, Tome 134 (1960) no. 6, pp. 1275-1278. http://geodesic.mathdoc.fr/item/DAN_1960_134_6_a1/