Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Akihiro Otsuka,A new approach to inter‐regional network externalities in Japan,Regional Science Policy & Practice,1757-7802,Elsevier BV,2021-06,13,3,1051-1068,https://cir.nii.ac.jp/crid/1360853567714017024,https://doi.org/10.1111/rsp3.12291