@article{MAN_1974__210_162622,
     author = {Ludwig Br\"ocker},
     title = {Zur {Theorie} der quadratischen {Formen} \"uber formal reellen {K\"orpern.}},
     journal = {Mathematische Annalen},
     pages = {233--256},
     publisher = {mathdoc},
     volume = {210},
     year = {1974},
     zbl = {0273.13018},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__210_162622/}
}