//-->
Efficiency, technical change, and returns to scale in large US banks : panel data evidence from an output distance function satisfying theoretical regularity
Feng, Guohua, (2009)
Semi-nonparametric estimates of currency substitution between the Canadian dollar and the US dollar
Serletis, Apostolos, (2010)
A primal Divisia technical change index based on the output distance function
Feng, Guohua, (2010)