@article{MZ_1969__111_171190,
     author = {Gerd Wittstock},
     title = {\"Uber indefinit symmetrisierbare lineare {Abbildungen.}},
     journal = {Mathematische Zeitschrift},
     pages = {131--144},
     publisher = {mathdoc},
     volume = {111},
     year = {1969},
     zbl = {0185.37903},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__111_171190/}
}