Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TOKINAGA Shozo and MATSUNO Seigo,Analysis of Factors affecting Changes in Formations of Outsourcing among Firms by using Mathematical Modeling : Focusing on the Profits/Prices Changes(General Contribution),Journal of Information and Management,18822614,Japan Society for Information and Management,2010,31,1,105-113,https://cir.nii.ac.jp/crid/1390001205289164928,https://doi.org/10.20627/jsim.31.1_105