Journal of Productivity Analysis
Journal of Productivity Analysis > 2001 > 15 > 3 > 217-246
Journal of Productivity Analysis > 2001 > 15 > 3 > 159-183
Journal of Productivity Analysis > 2001 > 15 > 3 > 201-215
Journal of Productivity Analysis > 2001 > 15 > 3 > 185-199