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Submitted on: 27 September 2005.
Revised on: 03 January 2006.
Accepted on: 27 February 2006.
___________________JOURNAL OF MEDIA ECONOMICS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
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Submitted on: 12 December 2011.
Revised on: 14 January 2012.
Accepted on: 14 February 2012.
___________________JOURNAL OF MEDIA ECONOMICS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
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