Journal of Productivity Analysis
Journal of Productivity Analysis > 2004 > 21 > 1 > 91-103
Journal of Productivity Analysis > 2004 > 21 > 1 > 7-23
Journal of Productivity Analysis > 2004 > 21 > 1 > 25-48
Journal of Productivity Analysis > 2004 > 21 > 1 > 67-89
Journal of Productivity Analysis > 2004 > 21 > 1 > 49-65