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@article{PIM_1971_N_S_11_25_a7, author = {Petar M. Vasi\'c and Jovan D. Ke\v{c}ki\'c}, title = {A {Generalisation} {Of} {The} {Concept} {Of} {Convexity}}, journal = {Publications de l'Institut Math\'ematique}, pages = {53 }, publisher = {mathdoc}, volume = {_N_S_11}, number = {25}, year = {1971}, url = {http://geodesic.mathdoc.fr/item/PIM_1971_N_S_11_25_a7/} }
Petar M. Vasić; Jovan D. Kečkić. A Generalisation Of The Concept Of Convexity. Publications de l'Institut Mathématique, _N_S_11 (1971) no. 25, p. 53 . http://geodesic.mathdoc.fr/item/PIM_1971_N_S_11_25_a7/