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Cohen, M. and S. Klepper (1996), A reprise of size and R&D, The Economic Journal 106, 925-951.
Heckman, J.J. (1979), Sample Selection Bias as a Specification Error, Econometrica 47, 153-162.
Henderson, J.V. (1974), The Size and Types of Cities, American Economic Review 89, 640-656.
Zucker, L. G., M. R. Darby and M.B. Brewer (1998) Intellectual Human Capital and the Birth of U.S.
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