6Alan Pifer, Lydia Bronte. Introduction: Squaring the Pyra- mid [ A ]. Alan Pifer, Lydia Bronte. Our Aging Society: Paradox and Promise [ C]. New York: W. W. Norton. 1986.
7D Coe, E Helpman. International R&D Spillovers [ J ]. Eu- ropean Economic Review, 1995, (39) : 859 - 887.
8J Eaton, S Kortum. Trade in Ideas : Patenting and Produc- tivity in the OECD[J]. Journal of International Economics, 1996, ( 40 ) : 251 - 278.
9E Borensztein, J D Gregorio, J W Lee. How Does Foreign Direct Investment Affect Economic Growth? [ J]. Journal of International Economics, 1998, (45) : 115 - 135.