Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1962__37_139243, author = {Hans Debrunner}, title = {Orthogonale {Dreibeine} in richtungsvollst\"andigen, stetigen {Geradenscharen} des {R3.}}, journal = {Commentarii mathematici Helvetici}, pages = {36--43}, publisher = {mathdoc}, volume = {37}, year = {1962}, zbl = {0108.35104}, url = {http://geodesic.mathdoc.fr/item/CMH_1962__37_139243/} }
Hans Debrunner. Orthogonale Dreibeine in richtungsvollständigen, stetigen Geradenscharen des R3.. Commentarii mathematici Helvetici, Tome 37 (1962), pp. 36-43. http://geodesic.mathdoc.fr/item/CMH_1962__37_139243/