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.
Ronald Fagin, Phokion G. Kolaitis, Lucian Popa, Wang Chiew Tan. Reverse data exchange: Coping with nulls. ACM Trans. Database Syst., 36(2):11, 2011. [doi]
Abstract is missing.