@article{1077471934, author = {Hsiung, Chuan-Chih}, title = {Asymptotic ruled surfaces}, journal = {Duke Math. J.}, volume = {10}, number = {1}, year = {1943}, pages = { 217-237}, language = {en}, url = {http://dml.mathdoc.fr/item/1077471934} }
Hsiung, Chuan-Chih. Asymptotic ruled surfaces. Duke Math. J., Tome 10 (1943) no. 1, pp. 217-237. http://gdmltest.u-ga.fr/item/1077471934/