@article{oai:repository.dl.itc.u-tokyo.ac.jp:00051721, author = {塚常, 健太 and 大戸, 朋子 and 橋元, 良明}, journal = {東京大学大学院情報学環情報学研究. 調査研究編 = Research survey reports in information studies. Interfaculty initiative in information studies, the University of Tokyo}, month = {Mar}, pages = {105--148}, title = {親同士の友人グループへの参加実態}, volume = {35}, year = {2019} }