@article{10_1017_fmp_2021_17,
     author = {Yoshiko Ogata},
     title = {An $H^{3}(G,{\mathbb T})$-valued index of symmetry-protected topological phases with on-site finite group symmetry for two-dimensional quantum spin systems},
     journal = {Forum of Mathematics, Pi},
     publisher = {mathdoc},
     volume = {9},
     year = {2021},
     doi = {10.1017/fmp.2021.17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/fmp.2021.17/}
}