@article{10_1017_S0017089500008946,
     author = {Baikoussis, Christos and Blair, David E.},
     title = {On the {Gauss} map of ruled surfaces},
     journal = {Glasgow mathematical journal},
     pages = {355--359},
     year = {1992},
     volume = {34},
     number = {3},
     doi = {10.1017/S0017089500008946},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008946/}
}