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.
Jeffrey Shallit, David Wilson. The 3x + 1 Problem and Finite Automata. Bulletin of the EATCS, 46:182-185, 1992.