@article{MZ_1975__142_172185,
     author = {Alexander Prestel},
     title = {A {Local-Global} {Principle} for {Quadric} {Forms.}},
     journal = {Mathematische Zeitschrift},
     pages = {91--96},
     publisher = {mathdoc},
     volume = {142},
     year = {1975},
     zbl = {0287.10016},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__142_172185/}
}