Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1976_12_5_a9, author = {Yu. L. Daletskii and E. A. Fadeeva}, title = {Hyperbolic equations with variable operator-valued coefficients}, journal = {Differencialʹnye uravneni\^a}, pages = {881--891}, publisher = {mathdoc}, volume = {12}, number = {5}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_5_a9/} }
Yu. L. Daletskii; E. A. Fadeeva. Hyperbolic equations with variable operator-valued coefficients. Differencialʹnye uravneniâ, Tome 12 (1976) no. 5, pp. 881-891. http://geodesic.mathdoc.fr/item/DE_1976_12_5_a9/