Lozano-Vivas A and DB Humphrey (2002). “Bias in Malmquist Index and Cost Function Productivity Measurement in Banking.” Int J Prod Econ 76(2): 177-188.
Lozano-Vivas A and DB Humphrey (2002). “Bias in Malmquist Index and Cost Function Productivity Measurement in Banking.” Int J Prod Econ 76(2): 177-188.