2C Comwell,P Schmidt and R C Sickles. Production Frontiers with Cross- Sectional and Time-Series Variation in Efficiency Levels [J]. Journal of Econometrics, 1990,46 ( 1/2 ) : 185-200.
3A Heshmati ,Y Mmulugeta. Technical Efficiency of the Uganda Matoke Farms[J]. Applied Economic Letters, 1996,3(7) :491-494.
4G. E. Battese,T. J. Coelli.Frontier production functions, technical efficiency and panel data: With application to paddy farmers in India[J]. Journal of Productivity Analysis . 1992 (1-2)
5Battese G E,,Coelli TJ.Frontier production functions,tech-nical efficiency and panel data:with application to paddy darmers inindia. Journal of Productivity Analysis . 1992