@article{oai:tsukuba.repo.nii.ac.jp:00017236,
 author = {Umehara, Masaaki and Yamada, Kotaro},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {229--237},
 title = {A duality on CMC-1 surfaces in hyperbolic space,and a hyperbolic analogue of the Osserman Inequality},
 volume = {21},
 year = {1997}
}