Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yamada Taizo and Watanabe Michiko,Solution of vehicle routing problem in consideration of reducing environment,Proceedings of JSPE Semestrial Meeting,,The Japan Society for Precision Engineering,2010,2010A,0,683-684,https://cir.nii.ac.jp/crid/1390001205653970688,https://doi.org/10.11522/pscjspe.2010a.0.683.0