Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1968_4_11_a13, author = {A. G. Ramm}, title = {Equations of the first kind}, journal = {Differencialʹnye uravneni\^a}, pages = {2056--2060}, publisher = {mathdoc}, volume = {4}, number = {11}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_11_a13/} }
A. G. Ramm. Equations of the first kind. Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 2056-2060. http://geodesic.mathdoc.fr/item/DE_1968_4_11_a13/