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Surface mining of coal : efficiency of US interior mines
Byrnes, Patricia - In: Applied economics 19 (1987) 12, pp. 1665-1673
Persistent link: https://www.econbiz.de/10001047290
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An approach to nonparametric smoothing techniques for regressions with discrete data
Mukhopadhyay, Kajal; Marsh, Lawrence C. - In: Applied economics 38 (2006) 3, pp. 301-305
Persistent link: https://www.econbiz.de/10003295036
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Scale, factor intensity and efficiency : an empirical study of the Chinese coal industry
Wu, Yanrui - In: Applied economics 25 (1993) 3, pp. 325-334
Persistent link: https://www.econbiz.de/10001143513
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An exploratory study on the migration-pattern impact of coal dust in the US
Cebula, Richard J.; Duquette, Christopher M. - In: Applied economics 55 (2023) 34, pp. 3996-4002
Persistent link: https://www.econbiz.de/10014299408
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Evolution of technical efficiency in Chinese coal mining firms : the roles of competition and technology
Yang, Chih-Hai; Tsou, Meng-wen - In: Applied economics 56 (2024) 2, pp. 133-150
Persistent link: https://www.econbiz.de/10014439860