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- HELPMAN, Elhanan - KRUGMAN, Paul R. Trade Policy and Market Structure. 1. ed., 4. print. Cambridge : The MIT Press, 1994. 191 s. ISBN 0-262-58098-5. [Copy count : 1, currently available 1, at library only 0]
- HELPMAN, Elhanan - KRUGMAN, Paul R. Trade Policy and Market Structure. 1. ed. Cambridge : The MIT Press, 1989. 191 s. ISBN 0-262-08182-2. [Copy count : 1, currently available 1, at library only 0]