1. Ardito-Barletta, N., Costs and Social Benefits of Agricultural Research in Mexico. Unpublished Ph.D. dissertation, Department of Economics, University of Chicago (1971).
2. Arrow, K. J., ‘Comment’, in The Rate and Direction of Inventive Activity (National Bureau of Economic Research). (Princeton: Princeton University Press, 1962) 353–8.
3. Baily, Martin N., Research and Development Costs and Profits: The U.S. Pharmaceutical Industry, M.I.T., unpublished manuscript (1970).
4. Brown, M. and Conrad, A. H., ‘The Influence of Research and Education on CES Production Relations’, in The Theory and Empirical Analysis of Production, ed. M. Brown, (N.B.E.R.: Studies on Income and Wealth, 1967) xxxI, 341–72.
5. Denison, Edward F., The Sources of Economic Growth in the United States and the Alternatives Before Us (Supplementary Paper No. 13) (New York: Committee for Economic Development, 1962).