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 C. Lagarias. Erdős, Klarner, and the 3x + 1 Problem. The American Mathematical Monthly, 123(8):753-776, 2016. [doi]