Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1975_11_11_a15, author = {S. M. Shugrin}, title = {Strong and weak extension of differential operators}, journal = {Differencialʹnye uravneni\^a}, pages = {2067--2082}, publisher = {mathdoc}, volume = {11}, number = {11}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_11_a15/} }
S. M. Shugrin. Strong and weak extension of differential operators. Differencialʹnye uravneniâ, Tome 11 (1975) no. 11, pp. 2067-2082. http://geodesic.mathdoc.fr/item/DE_1975_11_11_a15/