@article{oai:tsukuba.repo.nii.ac.jp:00017138,
 author = {Deszcz, Ryszard and Kucharski, Marek},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {113--130},
 title = {On curvature properties of certain generalized Robertson-Walker spacetimes},
 volume = {23},
 year = {1999}
}