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.
Henning F. Harmuth. A generalized concept of frequency and some applications. IEEE Transactions on Information Theory, 14(3):375-382, 1968. [doi]
Abstract is missing.