Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yoshiko Ogata,A $${{\mathbb {Z}}}_2$$-Index of Symmetry Protected Topological Phases with Time Reversal Symmetry for Quantum Spin Chains,Communications in Mathematical Physics,0010-3616,Springer Science and Business Media LLC,2019-07-22,374,2,705-734,https://cir.nii.ac.jp/crid/1361412890677680256,https://doi.org/10.1007/s00220-019-03521-5