@article{1255987064, author = {Fenton, P. C.}, title = {The growth of $\Phi \Phi''/\Phi'^{2}$ for convex functions}, journal = {Illinois J. Math.}, volume = {37}, number = {4}, year = {1993}, pages = { 502-507}, language = {en}, url = {http://dml.mathdoc.fr/item/1255987064} }
Fenton, P. C. The growth of $\Phi \Phi''/\Phi'^{2}$ for convex functions. Illinois J. Math., Tome 37 (1993) no. 4, pp. 502-507. http://gdmltest.u-ga.fr/item/1255987064/