Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1992_326_6_a4, author = {I. L. Sofronov}, title = {Conditions for complete transparency on a sphere for a}, journal = {Doklady Akademii Nauk}, pages = {953--957}, publisher = {mathdoc}, volume = {326}, number = {6}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_326_6_a4/} }
I. L. Sofronov. Conditions for complete transparency on a sphere for a. Doklady Akademii Nauk, Tome 326 (1992) no. 6, pp. 953-957. http://geodesic.mathdoc.fr/item/DAN_1992_326_6_a4/