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 "Martinsson, Per-Gunnar",Fast direct solvers for elliptic PDEs,,Society for Industrial and Applied Mathematics,2020,CBMS-NSF regional conference series in applied mathematics,,9781611976038,,https://cir.nii.ac.jp/crid/1130003903137657344