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.
Alberto Bertoni, Massimiliano Goldwurm, Paolo Massazza. Counting Problems and Algebraic Formal Power Series in Noncommuting Variables. Inf. Process. Lett., 34(3):117-121, 1990.