@article{oai:tsukuba.repo.nii.ac.jp:00041635,
 author = {SAKAKI, Makoto},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {},
 pages = {215--229},
 title = {Lorentzian Stationary Surfaces in 4-Dimensional Space Forms of Index 2},
 volume = {35},
 year = {2011}
}