Valdmanis VG (1995). “Estimating Output Substitutability of Hospital Services: A Distance Function Approach.” EJOR 80(3): 575-585.

Valdmanis VG (1996). “Rural Hospital Performance and its Correlates.” JPA 7(1): 63-80.

Uri ND (2003). “The Change in Technical and Allocative Efficiency of Local Exchange Carriers in the US.” INFOR 5(3): 53-64.

Uri ND (2003). “The Effect of Incentive Regulation in Telecommunications in the US.” Quality and Quantity 37(2): 169.

Uri ND (2004). “The Impact of Price Caps on the Technical Efficiency of Local Exchange Carriers in the USA.” Int J Technology, Policy and Management 4(2): 151-168.

Uri ND (2006). “A Note on the Technical and Allocative Efficiency of Local Exchange Carriers in the US.” Quality and Quantity 40(3): 383-406.

Utkin OB, VE Krivonozhko, IA Sablin and M Patrin (2002). “Constructions of Economic Functions in DEA Using Parametric Optimization Methods.” in Emrouznejad A, R Green and V Krivonozhko (eds.) Efficiency and Productivity Analysis in the 21st Century, International Research in Management Science.

Vakkuri J (2003). “Research Techniques and Their Use in Managing Non-Profit Organisations – an Illustration of DEA Analysis.” NPO Environments 19(3): 243-263.

Valdmanis V (1992). “Sensitivity Analysis for DEA Models: An Empirical Example Using Public vs. N.F.P Hospitals.” J Public Economics 4: 185-205.

Umetsu C, T Lekprichakul and U Chakravorty (2003). “Efficiency and Technical Change in the Philippine Rice Sector: A Malmquist Total Factor Productivity Analysis.” American J Agricultural Economics 85(4): 943-963.