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.
Juan Flaquer, G. Gárate, M. Pargada. Envelopes of moving quadric surfaces. Computer Aided Geometric Design, 9(4):299-312, 1992. [doi]
Abstract is missing.