Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Chen Mingchih and Mizutani Satoshi and Nakagawa Toshio,OPTIMAL BACKWARD AND BACKUP POLICIES IN RELIABILITY THEORY,Journal of the Operations Research Society of Japan,04534514,The Operations Research Society of Japan,2010,53,2,101-118,https://cir.nii.ac.jp/crid/1390282679087592448,https://doi.org/10.15807/jorsj.53.101