Adapt - Associazione per gli Studi Internazionali e Comparati sul Diritto del lavoro e sulle Relazioni Industriali

ILO, Policy Brief 2012

ILO, OECD, May 2012

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James Hamilton, U.S. Bureau of Labor Statistics, giugno 2011

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Luciano Lavecchia, Carlo Stagnaro, IBL, May 2010

U.S. Department of Labour, March 2010

Cristina Martinez Fernandez, Carlos Hinojosa, Gabriela Miranda, Oecd, 8 February 2010

Ilo, December 2009

Deborah Fleischer, Green Impact, November 2009

Lene Olsen, Global Union Research Network, November 2009

Carlo Stagnaro (edited by ), Adapt Dossier 2009, issue 9

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Oecd, 2009

Peter Szovics, Manfred Tessaring, Clive Walmsley, John McGrath, 2009

GHK Consulting, 29 May 2009

GHK Consulting, 29 May 2009

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Andrew Morriss, William Bogart, Andrew Dorchak, Roger Meiners, March 2009

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Allister Slingenberg, Koen Rademaekers, Ekim Sincer, Ruud van der Aa, Ecorys, December 2008

Etuc, Istas, Sda, Syndex, Wuppertal Institute, 2007