%0 Journal Article %A Murray S. Klamkin %T Two Non-Negative Quadratic Forms. %J Elemente der Mathematik %D 1973 %P 141-146 %V 28 %I mathdoc %U http://geodesic.mathdoc.fr/item/ELMA_1973__28_141125/ %F ELMA_1973__28_141125