@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/}
}