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 "Hagelgans, Martin",The impact of digitalization on sports broadcasting : an analysis of how streaming changed the German sports broadcasting market,,Springer Gabler,2022,Research,,9783658398682,,https://cir.nii.ac.jp/crid/1130299042337992320