Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Kristiaan Kerstens, Ignace Van de Woestyne. Negative data in DEA: a simple proportional distance function approach. JORS, 62(7):1413-1419, 2011. [doi]