@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/