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.
Ludwig Nastansky, Stanley M. Selkow, Neil F. Stewart. Cost-minimal trees in directed acyclic graphs. Math. Meth. of OR, 18(1):59-67, 1974. [doi]