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.
Arturo Carpi, Aldo de Luca. Periodic-like words, periodicity, and boxes. Acta Informatica, 37(8):597-618, 2001. [doi]