Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1969_5_3_a14, author = {Yu. K. Lando}, title = {The $F$-index and $F$-normal solvability of integro-differential operators}, journal = {Differencialʹnye uravneni\^a}, pages = {546--555}, publisher = {mathdoc}, volume = {5}, number = {3}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_3_a14/} }
Yu. K. Lando. The $F$-index and $F$-normal solvability of integro-differential operators. Differencialʹnye uravneniâ, Tome 5 (1969) no. 3, pp. 546-555. http://geodesic.mathdoc.fr/item/DE_1969_5_3_a14/