@article{oai:tsukuba.repo.nii.ac.jp:00020026,
 author = {初貝, 安弘 and HATSUGAI, Yasuhiro},
 issue = {6},
 journal = {New Journal of Physics},
 month = {Jun},
 title = {Symmetry-protected \mathbb{Z}_2 -quantization and quaternionic Berry connection with Kramers degeneracy},
 volume = {12},
 year = {2010},
 yomi = {ハツガイ, ヤスヒロ}
}