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Clark, Damon and Fahr, Rene (2002) The promise of workplace training for non-college bound youth: theory and evidence from German apprenticeship. CEPDP (518). London School of Economics and Political Science. Centre for Economic Performance, London, UK. ISBN 0753019167
Robinson, Peter (2008) Correlation testing in time series, spatial and cross-sectional data. Econometrics Papers (EM/2009/530). Suntory and Toyota International Centres for Economics and Related Disciplines, London, UK.
Robinson, Peter (2008) Correlation testing in time series, spatial and cross-sectional data. Journal of Econometrics, 147 (1). pp. 5-16. ISSN 0304-4076