@article{oai:tsukuba.repo.nii.ac.jp:00051977, author = {佐野, 幸恵 and SANO, Yukie and Takayasu, Hideki and Havlin, Shlomo and Takayasu, Misako}, issue = {3}, journal = {PLOS ONE}, month = {Mar}, title = {Identifying long-term periodic cycles and memories of collective emotion in online social media}, volume = {14}, year = {2019}, yomi = {サノ, ユキエ} }