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.
Harry Buhrman, Ronald de Wolf. Quantum zero-error algorithms cannot be composed. Inf. Process. Lett., 87(2):79-84, 2003. [doi]