1. Integer programming, methods, uses and computation;Balinski;Management Science,1965
2. Facility location and vehicle allocation for provision of an emergency service;Berlin,1972
3. On finding p medians;Boffey,1978
4. The dynamic set covering problem;Chrissis;Applied Mathematics Modelling,1982
5. The optimum location of multi-centers on a graph;Christofides;Operational Research Quarterly,1971