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Accounting for Environmental Effects and Statistical Noise in Data Envelopment Analysis[J] . H. O. Fried,C. A. K. Lovell,S. S. Schmidt,S. Yaisawarng.  Journal of Productivity Analysis . 2002 (1)
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Do subsidies have positive impacts on R&D and innovation activities at the firm level?[J] . Tommy H. Clausen.  Structural Change and Economic Dynamics . 2009 (4)
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"A Slacks-Based Measure of Super-Efficiency in Data Envelopment Analysis,". Tone,K. European Journal of Operational Research . 2002