@article{10_4064_ap_61_1_77_88,
     author = {Janusz Krzyszkowski},
     title = {Necessary and sufficient conditions for generalized convexity},
     journal = {Annales Polonici Mathematici},
     pages = {77--88},
     publisher = {mathdoc},
     volume = {61},
     number = {1},
     year = {1995},
     doi = {10.4064/ap-61-1-77-88},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-61-1-77-88/}
}