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Shepherd, B. and van der Marel, Erik (2011) Trade impacts of services policies at the sectoral level: an empirical estimation. Working paper. Group d'Economie Mondiale, Paris, France.
McDiarmid, Colin, Reed, B., Schrijver, A. and Shepherd, B. (1993) Non-interfering network flows. Operational Research working papers (LSEOR 93.6). Department of Operational Research, London School of Economics and Political Science, London, UK.