Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1968_179_2_a4, author = {A. H. Gudiev}, title = {The {Cauchy} problem for normally hyperbolic equations with unbounded coefficients}, journal = {Doklady Akademii Nauk}, pages = {267--270}, publisher = {mathdoc}, volume = {179}, number = {2}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_2_a4/} }
A. H. Gudiev. The Cauchy problem for normally hyperbolic equations with unbounded coefficients. Doklady Akademii Nauk, Tome 179 (1968) no. 2, pp. 267-270. http://geodesic.mathdoc.fr/item/DAN_1968_179_2_a4/