@article{JRAM_1962__210_150532,
     author = {B. Bernstein and R.A. Toupin},
     title = {Some properties of the {Hessian} {Matrix} of a {Strictly} {Convex} {Function.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {65--72},
     publisher = {mathdoc},
     volume = {210},
     year = {1962},
     zbl = {0107.27701},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1962__210_150532/}
}