@article{GDZPPN002179687,
title = {Some properties of the Hessian Matrix of a Strictly Convex Function.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {211},
year = {1962},
pages = {65-72},
zbl = {0107.27701},
url = {http://dml.mathdoc.fr/item/GDZPPN002179687}
}
Bernstein, B.; Toupin, R.A. Some properties of the Hessian Matrix of a Strictly Convex Function.. Journal für die reine und angewandte Mathematik, Tome 211 (1962) pp. 65-72. http://gdmltest.u-ga.fr/item/GDZPPN002179687/