Briec W and K Kerstens (2006). “Input, Output and Graph Technical Efficiency Measures on Non-Convex FDH Models with Various Scaling Laws: An Integrated Approach Based Upon Implicit Enumeration Algorithms.” TOP: An Official J the Spanish Society of Statistics and Operations Research 14(1): 135-166.
Briec W and K Kerstens (2006). “Input, Output and Graph Technical Efficiency Measures on Non-Convex FDH Models with Various Scaling Laws: An Integrated Approach Based Upon Implicit Enumeration Algorithms.” TOP: An Official J the Spanish Society of Statistics and Operations Research 14(1): 135-166.