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@article{DAN_1981_258_5_a8, author = {V. P. Soltan}, title = {On an extension of the concept of $H$-convexity}, journal = {Doklady Akademii Nauk}, pages = {1059--1062}, publisher = {mathdoc}, volume = {258}, number = {5}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_258_5_a8/} }
V. P. Soltan. On an extension of the concept of $H$-convexity. Doklady Akademii Nauk, Tome 258 (1981) no. 5, pp. 1059-1062. http://geodesic.mathdoc.fr/item/DAN_1981_258_5_a8/