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
"Laudal, Olav Arnfinn",Note on the projective limit on small categories,,"Matematisk institutt, Universitetet i Oslo",1970,Preprint series,,,,https://cir.nii.ac.jp/crid/1130282271510228480