@article{oai:tsukuba.repo.nii.ac.jp:00015802,
 author = {Matsuda, Hiroo},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {113--129},
 title = {On Lorentz manifolds with abundant isometries},
 volume = {13},
 year = {1989}
}