@article{GDZPPN002415607, title = {A Local-Global Principle for Quadric Forms.}, journal = {Mathematische Zeitschrift}, volume = {142}, year = {1975}, pages = {91-96}, zbl = {0287.10016}, url = {http://dml.mathdoc.fr/item/GDZPPN002415607} }
Prestel, Alexander. A Local-Global Principle for Quadric Forms.. Mathematische Zeitschrift, Tome 142 (1975) pp. 91-96. http://gdmltest.u-ga.fr/item/GDZPPN002415607/