Bouligand, Georges Surfaces douĂ©es d’une famille d’asymptotiques ordinaires. (French) Zbl 0063.00572 Bull. Soc. Math. Fr. 74, 31-41 (1946). Not reviewed PDF BibTeX XML Cite \textit{G. Bouligand}, Bull. Soc. Math. Fr. 74, 31--41 (1946; Zbl 0063.00572) Full Text: DOI Numdam EuDML