Rosse's Model Revisited: Moving to Concentric Circles to Explain Newspaper Competition - Bridges, Janet A. and Litman, Barry R. and Bridges, Lamar W. (Journal of Media Economics, 2002)
https://katalog.adlr.link/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTIwNy9zMTUzMjc3MzZtZTE1MDFfMg