@article{PA_2015_4_1_a0,
     author = {B. A. Bhayo and L. Yin},
     title = {On the generalized convexity and concavity},
     journal = {Problemy analiza},
     pages = {3--10},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2015_4_1_a0/}
}