@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/