@article{oai:tsukuba.repo.nii.ac.jp:00015064,
 author = {Katsura, Hosho and Hirano, Takaaki and 初貝, 安弘 and HATSUGAI, Yasuhiro},
 issue = {1},
 journal = {Physical review B},
 month = {Jul},
 title = {Exact analysis of entanglement in gapped quantum spin chains},
 volume = {76},
 year = {2007},
 yomi = {ハツガイ, ヤスヒロ}
}