Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1965__6_2_a0, author = {Havel, V\'aclav}, title = {Zur {Normalprojektion} von {Geradenb\"uscheln}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {145--147}, publisher = {mathdoc}, volume = {06}, number = {2}, year = {1965}, mrnumber = {0187128}, zbl = {0137.43303}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/CMUC_1965__6_2_a0/} }
Havel, Václav. Zur Normalprojektion von Geradenbüscheln. Commentationes Mathematicae Universitatis Carolinae, Tome 06 (1965) no. 2, pp. 145-147. http://geodesic.mathdoc.fr/item/CMUC_1965__6_2_a0/