Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sonoda Eiji,Dentsu Data System; its Development and Cost-benefit Analysis,Journal of Information Processing and Management,0021-7298,Japan Science and Technology Agency,1976,19,1,1-10,https://cir.nii.ac.jp/crid/1390282680484932608,https://doi.org/10.1241/johokanri.19.1