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.
Christoph Hornung. A Method for Solving the Visibility Problem. IEEE Computer Graphics and Applications, 4(7):26-33, 1984. [doi]
Abstract is missing.