Wei QL and Z Xiao (1991). “Production Functions and the Compositive Data Envelopment Analysis Model.” J Systems Science and Mathematical Sciences 11.

Wei QL, H Yan and G Hao (2007). “Characteristics and Structures of Weak Efficient Surfaces of Production Possibility Sets.” J Mathematical Analysis and Applications 327(2): 1055-1074.

Wei Y-M, Y Fan, C Lu and H-T Tsai (2004). “The Assessment of Vulnerability to Natural Disasters in China by Using the DEA Method.” Environmental Impact Assessment Review 24(4): 427-439.

Ward DR (2005). “Measuring the Value of Product Characteristics in the UK Monthly Savings Market.” Service Industries Journal 25(7): 907-923.

Ward PT, JE Storbeck, SL Mangum and PE Byrnes (1997). “An Analysis of Staffing Efficiency in US Manufacturing: 1983 and 1989.” Ann Oper Res 73: 67-89.

Warning S (2004). “Performance Differences in German Higher Education: Empirical Analysis of Strategic Groups.” Review of Industrial Organization 24(4): 393-408.

Watcharasriroj B and JCS Tang (2004). “The Effects of Size and Information Technology on Hospital Efficiency.” J High Technology Management Research 15(1): 1.

Watson GH (2000). “The Ethics of Analysis: How to Keep Your Numbers Honest.” Quality Progress 33(8): 18.

Waxman HC, SYL Huang, L Anderson and T Weinstein (1997). “Classroom Process Differences in Inner-City Elementary Schools.” J Education Research 91(1): 49-59.

Weber CA, JR Current and A Desai (1998). “Non-Cooperative Negotiation Strategies for Vendor Selection.” EJOR 108(1): 208-223.