Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1966__16_3_a6, author = {Vala, Josef}, title = {Quadratische {Doppelverh\"altnisscharen} auf {Regelfl\"achen}}, journal = {Mathematica slovaca}, pages = {257--267}, publisher = {mathdoc}, volume = {16}, number = {3}, year = {1966}, mrnumber = {0211316}, zbl = {0166.17301}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/MASLO_1966__16_3_a6/} }
Vala, Josef. Quadratische Doppelverhältnisscharen auf Regelflächen. Mathematica slovaca, Tome 16 (1966) no. 3, pp. 257-267. http://geodesic.mathdoc.fr/item/MASLO_1966__16_3_a6/