Seabright, Paul and Weeds, Helen (2007) Competition and market power in broadcasting: where are the rents? In: Economic regulation of broadcasting markets: evolving technology and challenges for policy. Seabright, Paul and Von Hagen, Jurgen (eds.) Cambridge University Press. Chapter 3. Cambridge. pp. 47-80. ISBN 978-0-521-87405-2 , 978-0-521-69634-0