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
"Axelsson, O. and Gustafsson, I.","A preconditioned conjugate gradient method for finite element equations, which is stable for rounding errors",,"Mathematisch Instituut, Katholieke Universiteit",1979,Report,,,,https://cir.nii.ac.jp/crid/1130000796408974464