@article{oai:tsukuba.repo.nii.ac.jp:00041569,
 author = {SHAIKH, Absos Ali and YOON, Dae Won and HUI, Shyamal Kumar},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {},
 pages = {305--326},
 title = {On Quasi-Einstein Spacetimes},
 volume = {33},
 year = {2009}
}