共 10 条
[9]
International R&D spillovers[J] . David T. Coe,Elhanan Helpman.European Economic Review . 1995 (5)
[10]
A model for technical inefficiency effects in a stochastic frontier production function for panel data[J] . G. E. Battese,T. J. Coelli.Empirical Economics . 1995 (2)