@article{03906783, title = {Transformations which preserve convexity.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {8}, year = {1985}, pages = {49-55}, doi = {10.1155/S0161171285000047}, zbl = {0568.26004}, language = {en}, url = {http://dml.mathdoc.fr/item/03906783} }
Fontenot, Robert A.; Proschan, Frank. Transformations which preserve convexity.. International Journal of Mathematics and Mathematical Sciences, Tome 8 (1985) pp. 49-55. doi : 10.1155/S0161171285000047. http://gdmltest.u-ga.fr/item/03906783/