Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_194_1_a4, author = {N. H. Ibragimov}, title = {Conformal invariance and {Huygens'} principle}, journal = {Doklady Akademii Nauk}, pages = {24--27}, publisher = {mathdoc}, volume = {194}, number = {1}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a4/} }
N. H. Ibragimov. Conformal invariance and Huygens' principle. Doklady Akademii Nauk, Tome 194 (1970) no. 1, pp. 24-27. http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a4/