@article{GDZPPN002487985,
title = {Ruled Surfaces with Vanishing Second Gaussian Curvature.},
journal = {Monatshefte f\"ur Mathematik},
volume = {114},
year = {1992},
pages = {177-182},
zbl = {0765.53003},
url = {http://dml.mathdoc.fr/item/GDZPPN002487985}
}
Blair, D.E.; Koufogiorgos, Th. Ruled Surfaces with Vanishing Second Gaussian Curvature.. Monatshefte für Mathematik, Tome 114 (1992) pp. 177-182. http://gdmltest.u-ga.fr/item/GDZPPN002487985/