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.
Radamis Boutros-Attia, Jim Gale, Gulay Sencer. An Electronic Tone Ringer for the Telephone. IEEE Transactions on Communications, 20(1):43-48, 1972. [doi]