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@article{DAN_1970_192_1_a1, author = {V. F. Dem'yanov}, title = {The finding of saddle points on polyhedra}, journal = {Doklady Akademii Nauk}, pages = {13--15}, publisher = {mathdoc}, volume = {192}, number = {1}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_1_a1/} }
V. F. Dem'yanov. The finding of saddle points on polyhedra. Doklady Akademii Nauk, Tome 192 (1970) no. 1, pp. 13-15. http://geodesic.mathdoc.fr/item/DAN_1970_192_1_a1/