@article{oai:tsukuba.repo.nii.ac.jp:00016234,
 author = {Choi, Soon Meen},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {285--304},
 title = {On the Gauss map of ruled surfaces in a 3-dimensional minkowski space},
 volume = {19},
 year = {1995}
}