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.
Mary Shaw, William A. Wulf, Ralph L. London. Abstraction and Verification in Alphard: Defining and Specifying Iteration and Generators. Communications of the ACM, 20(8):553-564, 1977.
Abstract is missing.