Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Niki Hiroshi,On the review,Bulletin of the Japan Society for Industrial and Applied Mathematics,2432-1982,The Japan Society for Industrial and Applied Mathematics,1997,7,4,255,https://cir.nii.ac.jp/crid/1390282680743390464,https://doi.org/10.11540/bjsiam.7.4_255