A. Goel, M. H. Henzinger, S. Plotkin, and E. Tardos, “Scheduling data transfers in a network and the set scheduling problem,” in Proceedings of the 31st annual ACM symposium on Theory of computing,  Atlanta, GA, United States, 1999, pp. 189–197.
LibreCat: https://research-explorer.ista.ac.at/record/11691
DOI: 10.1145/301250.301300