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
"Johnsen, Trygve",A classification of covariants and contravariants of plane cubics,,"Institute of Mathematics, University of Oslo",1982,Preprint series. Mathematics,,8255304894,,https://cir.nii.ac.jp/crid/1130282270000149760