Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) HU Qiying and YUE Wuyi,Optimal Replacement of a System According to a Semi-Markov Decision Process in a Semi-Markov Environment,日本オペレーションズ・リサーチ学会秋季研究発表会アブストラクト集,,The Operations Research Society of Japan,2002-09-11,2002,,72-73,https://cir.nii.ac.jp/crid/1572261552326165760,