Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Abe Keisuke and Komaya Kiyotoshi,A Planning Method for Usage of Vehicles using the Optimal Assignment Algorithm,"IEEJ Transactions on Electronics, Information and Systems",03854221,The Institute of Electrical Engineers of Japan,1987,107,10,939-946,https://cir.nii.ac.jp/crid/1390282679583846912,https://doi.org/10.1541/ieejeiss1987.107.10_939