@book{ BC0214303X, author = "Posamentier, Alfred S. and Geretschläger, Robert and 松浦, 俊輔 ", title = "円をめぐる冒険 : 幾何学から文化史まで", publisher = "紀伊國屋書店", year = "2020", URL = "https://ci.nii.ac.jp/ncid/BC0214303X" }