Cantner U, H Hanusch and G Westermann (1995). “Efficiency of Regulated Firms and Deregulation – Non-Marketable Outputs and DEA.” Jahrbucher Fur Nationalokonomie Und Statistik 21: 257-274.

Cantner U, H Hanusch and G Westermann (1995). “Efficiency of Regulated Firms and Deregulation – Non-Marketable Outputs and DEA.” Jahrbucher Fur Nationalokonomie Und Statistik 21: 257-274.

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