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On substitution and the effective rate of protection
Humphrey, D. B., (1970)
Leitfaden Risikoanalyse bei den Zollkontrollen
Eurotoll : European research project for toll effects and pricing strategies
(1999)
Moderne AuĂenwirtschaftstheorie
Ethier, Wilfred, (1991)
The WTO and the political economy of trade policy
Ethier, Wilfred, (2008)
Unilateralism in a multilateral world
Ethier, Wilfred, (2003)