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.
M. Keil. A Simple Algorithm for Determining the Envelope of a Set of Lines. Inf. Process. Lett., 39(3):121-124, 1991.