@article{oai:tsukuba.repo.nii.ac.jp:00015840,
 author = {Itoh, Mitsuhiro},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {291--301},
 title = {Some geometrical aspects of Riemannian monifolds with a pole},
 volume = {4},
 year = {1980}
}