著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL "Lehtonen, Tapani and Arjas, Elja",Approximating many server queues by means of single server queues II : simulation experiments,,Helsinki School of Economics,1978,Helsingin Kauppakorkeakoulun julkaisuja,,9516991807,,https://cir.nii.ac.jp/crid/1130282270305702144