1. K. J. Arrow, Production and Capital: Collected Papers (Belknap Harvard, 1985), Vol. 5.
2. R. J. Barro and X. Sala-i-Martin, Economic Growth (McGraw-Hill, New York, 1995).
3. G. M. Grossman and E. Helpman, Innovation and Growth in the Global Economy (MIT, Cambridge, MA, 1991).
4. K. Shell, “Applications of Pontryagin’s maximum principle to economics,” in Mathematical Systems Theory and Economics (Springer, Berlin, 1969), Vol. 1, pp. 241–292.
5. R. M. Solow, Growth Theory: An Exposition (Oxford Univ. Press, New York, 1970).