@article{oai:repository.dl.itc.u-tokyo.ac.jp:02000353, author = {石川, 博康 and ISHIKAWA, Hiroyasu}, issue = {1}, journal = {社會科學研究, Journal of Social Science}, month = {Mar}, note = {特集 新型コロナウイルス感染症(COVID-19)への対応と社会科学, 第一部, Featured Theme:Social Sciences Responding to COVID-19, Part 1}, pages = {29--39}, title = {パンデミックによる事情変更と契約の改訂}, volume = {72}, year = {2021} }