著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Hendriks, Harrie",On the existence of a free subgroup of finite index,,"Mathematisch Instituut, Katholieke Universiteit",1976,Report,,,,https://cir.nii.ac.jp/crid/1130282270916483712