Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1973__28_141125, author = {Murray S. Klamkin}, title = {Two {Non-Negative} {Quadratic} {Forms.}}, journal = {Elemente der Mathematik}, pages = {141--146}, publisher = {mathdoc}, volume = {28}, year = {1973}, zbl = {0266.52006}, url = {http://geodesic.mathdoc.fr/item/ELMA_1973__28_141125/} }
Murray S. Klamkin. Two Non-Negative Quadratic Forms.. Elemente der Mathematik, Tome 28 (1973), pp. 141-146. http://geodesic.mathdoc.fr/item/ELMA_1973__28_141125/