1. Computers and Intractability, A Guide to the Theory of NP-Completeness;Garey,1979
2. Solving covering problems and the uncapacited plant location problem on trees;Kolen;European Journal of Operational Research,1983
3. C.N. Judice, E.J. Addeo, M.I. Eige, H.L. Lemberg, Video on demand: a wideband service a myth?, in: Proceedings of the 1986 International Conference on Communication (ICC'86), 1986, pp. 1735–1739
4. Discrete Location Theory;Mirchandani,1990
5. A.D. Gelman, S. Halfin, Analysis of resource sharing in information providing services, in: Proceedings of 1990 GLOBECOM,1990, pp. 312–316