Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_192_1_a10, author = {B. N. Khimchenko}, title = {On a theorem of {M.\,V.~Keldysh} and {M.\,A.~Lavrent{\textquoteright}ev}}, journal = {Doklady Akademii Nauk}, pages = {46--47}, publisher = {mathdoc}, volume = {192}, number = {1}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_1_a10/} }
B. N. Khimchenko. On a theorem of M.\,V.~Keldysh and M.\,A.~Lavrent’ev. Doklady Akademii Nauk, Tome 192 (1970) no. 1, pp. 46-47. http://geodesic.mathdoc.fr/item/DAN_1970_192_1_a10/