Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1998_64_5_a18, author = {M. K. Chernishov}, title = {Invertibility of first-order linear differential operators}, journal = {Matemati\v{c}eskie zametki}, pages = {796--800}, publisher = {mathdoc}, volume = {64}, number = {5}, year = {1998}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_5_a18/} }
M. K. Chernishov. Invertibility of first-order linear differential operators. Matematičeskie zametki, Tome 64 (1998) no. 5, pp. 796-800. http://geodesic.mathdoc.fr/item/MZM_1998_64_5_a18/