Hjalmarsson L, SC Kumbhakar and A Heshmati (1996). ?DEA, DFA and SFA: A Comparison.” JPA 7(2-3): 303-327.
Hjalmarsson L, SC Kumbhakar and A Heshmati (1996). ?DEA, DFA and SFA: A Comparison.” JPA 7(2-3): 303-327.