@article{1077467630, author = {Gabriel, R. F.}, title = {A generalized Schwarzian derivative and convex functions}, journal = {Duke Math. J.}, volume = {24}, number = {1}, year = {1957}, pages = { 617-626}, language = {en}, url = {http://dml.mathdoc.fr/item/1077467630} }
Gabriel, R. F. A generalized Schwarzian derivative and convex functions. Duke Math. J., Tome 24 (1957) no. 1, pp. 617-626. http://gdmltest.u-ga.fr/item/1077467630/