Smirlis YG, EK Maragos and DK Despotis (2006). “Data Envelopment Analysis with Missing Values: An Interval DEA Approach.” Appl Math Comput 177(1): 1-10.

Smith CE, SVM Kleinbeck, K Fernengel and LS Mayer (1997). “Efficiency of Families Managing Home Health Care.” Ann Oper Res 73: 157-175.

Smith P (1990). “Data Envelopment Analysis Applied to Financial Statements.” Omega 18(2): 131-138.

Smith P (1994). “Public Sector Efficiency Measurements: Applications of Data Envelopment Analysis.” JORS 45(1): 117-118.

Smith P (1997). “Model Misspecification in Data Envelopment Analysis.” Ann Oper Res 73: 233-252.

Smith P and D Mayston (1987). “Measuring Efficiency in the Public Sector.” Omega 15(3): 181-189.

Singfat C, HT Keh and X Jiye (2006). “Efficiency, Effectiveness and Productivity of Marketing in Services.” EJOR 170(1): 265-276.

Singfat C-C-L (1998). “Bidding Efficiencies for Rights to Car Ownership in Singapore.” Omega 26(2): 297-306.

Simar L and PW Wilson (2007). “Estimation and Inference in Two-Stage, Semi-Parametric Models of Production Processes.” J Econometrics 136(1): 31-64.

Simar L and V Zelenyuk (2006). “On Testing Equality of Distributions of Technical Efficiency Scores.” Econometric Reviews 25(4): 497-522.