By Bouckaert Jan   Verboven Frank   in Journal of Regulatory Economics

ISSN:0922-680X|26|3|321-351

Springer Publishing Company ‎(2004)‎

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By Ferrari Stijn   Verboven Frank   Degryse Hans   in The American Economic Review

ISSN:0002-8282|100|3|1046-1079

American Economic Association‎(2010)‎

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