@article{1230130004,
author = {SAKAI, Fumio},
title = {Ruled fibrations on normal surfaces},
journal = {J. Math. Soc. Japan},
volume = {40},
number = {4},
year = {1988},
pages = { 249-269},
language = {en},
url = {http://dml.mathdoc.fr/item/1230130004}
}
SAKAI, Fumio. Ruled fibrations on normal surfaces. J. Math. Soc. Japan, Tome 40 (1988) no. 4, pp. 249-269. http://gdmltest.u-ga.fr/item/1230130004/