Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1969_184_2_a10, author = {V. A. Toponogov}, title = {Extremal theorems for {Riemannian} spaces with curvature bounded from above}, journal = {Doklady Akademii Nauk}, pages = {300--302}, publisher = {mathdoc}, volume = {184}, number = {2}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_2_a10/} }
V. A. Toponogov. Extremal theorems for Riemannian spaces with curvature bounded from above. Doklady Akademii Nauk, Tome 184 (1969) no. 2, pp. 300-302. http://geodesic.mathdoc.fr/item/DAN_1969_184_2_a10/