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Behrens, Kristian, Mion, Giordano, Murata, Yasusada and Südekum, Jens (2009) Trade, wages and productivity. CEP Discussion Paper, No. 942. Centre for Economic Performance, London School of Economics and Political Science, London, UK.
Helpman, Elhanan, Melitz, Marc J. and Rubinstein, Yona (2008) Estimating trade flows: trading partners and trading volumes. Quarterly Journal of Economics, 123 (2). pp. 441-487. ISSN 0033-5533
Mion, Giordano (2009) Strengthening economic linkages between Leeds and Manchester: feasibility and implications (structural model appendix). The Northern Way, Newcastle upon Tyne.