Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Stefano Colombo and Noriaki Matsushima,Competition between offline and online retailers with heterogeneous customers,ISER discussion paper,0473453X,Toyonaka : Institute of Social and Economic Research,2019-05,,1056,1-50,https://cir.nii.ac.jp/crid/1523669555943132800,