3SPENCER B J, BRANDER J A. International R&D Rivalry and Industrial Strategy [ J ]. Economic Research Studies, 1983,50 ( 4 ) :707-722.
4GREGORY G E, PIPPENGER M K. Trade policy with endogenous product durability [ J ]. The International Trade Journal, 2002,16 ( 2 ): 181-201.
5ISHIKAWA J,SPENCER B J. Rent-shifting export subsidies with an imported intermediate product [ A]. National Bureau of Economic Reasearch[C ]. London:Cambridge University Press,1996.