@article{oai:tsukuba.repo.nii.ac.jp:00015074,
 author = {Ryu, S. and 初貝, 安弘 and HATSUGAI, Yasuhiro},
 issue = {24},
 journal = {Physical review B},
 month = {Jun},
 title = {Entanglement entropy and the Berry phase in the solid state},
 volume = {73},
 year = {2006},
 yomi = {ハツガイ, ヤスヒロ}
}