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Klump, R; McAdam, P; Willman, A. (2007). "Factor Substitution and Factor Augmenting Technical Progress in the US: A Normalized Supply-Side System Approach". Review of Economics and Statistics. 89 (1): 183–192. doi:10.1162/rest.89.1.183. hdl:10419/152801. S2CID57570638.