@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/