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Efficiency estimation with heteroscedasticity in a panel data model
Kumbhakar, Subal - In: Applied economics 29 (1997) 3, pp. 379-386
Persistent link: https://www.econbiz.de/10001220892
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KLEM substitutability : a dynamic flexible demand system
Serletis, Apostolos - In: Applied economics 22 (1990) 2, pp. 275-283
Persistent link: https://www.econbiz.de/10001079506
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Economic performance of US class 1 railroads : a stochastic frontier approach
Kumbhakar, Subal - In: Applied economics 21 (1989) 11, pp. 1433-1446
Persistent link: https://www.econbiz.de/10001072456