Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1963_148_2_a9, author = {E. M. Landis}, title = {A three-spheres theorem}, journal = {Doklady Akademii Nauk}, pages = {277--279}, publisher = {mathdoc}, volume = {148}, number = {2}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a9/} }
E. M. Landis. A three-spheres theorem. Doklady Akademii Nauk, Tome 148 (1963) no. 2, pp. 277-279. http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a9/