Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1987_42_1_a12, author = {N. N. Amosova}, title = {A supplement to {W.~Richter's} theorem}, journal = {Matemati\v{c}eskie zametki}, pages = {120--123}, publisher = {mathdoc}, volume = {42}, number = {1}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_1_a12/} }
N. N. Amosova. A supplement to W.~Richter's theorem. Matematičeskie zametki, Tome 42 (1987) no. 1, pp. 120-123. http://geodesic.mathdoc.fr/item/MZM_1987_42_1_a12/