@article{CMH_1982__57_139891,
     author = {K. Vogtmann},
     title = {A {Stiefel} complex for the orthogonal group of a field.},
     journal = {Commentarii mathematici Helvetici},
     pages = {11--21},
     publisher = {mathdoc},
     volume = {57},
     year = {1982},
     zbl = {0506.20018},
     url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139891/}
}