Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
"Zennyo, Yusuke",Freemium competition among ad-sponsored platforms,Information Economics and Policy,0167-6245,Elsevier B.V.,2020-03,50,,100848,https://cir.nii.ac.jp/crid/1050856995322502912,https://doi.org/10.2139/ssrn.2777918