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.
Anders Björner, Christophe Reutenauer. Rationality of the Möbius Function of Subword Order. Theoretical Computer Science, 98(1):53-63, 1992.