@article{05081398,
title = {Lightlike ruled surfaces in },
journal = {Balkan Journal of Geometry and its Applications (BJGA)},
volume = {11},
year = {2006},
pages = {88-100},
zbl = {1104.53010},
language = {en},
url = {http://dml.mathdoc.fr/item/05081398}
}
Kılıç, Erol; Karadaǧ, H.Bayram. Lightlike ruled surfaces in . Balkan Journal of Geometry and its Applications (BJGA), Tome 11 (2006) pp. 88-100. http://gdmltest.u-ga.fr/item/05081398/