@article{oai:tsukuba.repo.nii.ac.jp:00017334,
 author = {Sakai, Makoto},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {239--246},
 title = {Spacelike minimal surfaces in 4-dimensional Lorentzian space forms},
 volume = {25},
 year = {2001}
}