@article{oai:tsukuba.repo.nii.ac.jp:00017228,
 author = {Choi, Soon Meen and Ki, U-Hang and Suh, Young Jin},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {273--279},
 title = {On the Gauss map of null scrolls},
 volume = {22},
 year = {1998}
}