materials balance-based production model introduced by Coelli et al. (2007). Based on this, some new [...] Linear programming problems 16–21 Models based on 1( )oT z Models based on 2 ( )oT z * 1 , , 1 1 1 min . ( [...] case if only the models based on either 1( )oT z or 2 ( )oT z are applied.16 Based on the linear programming