The PQ-Median problem: Location and districting of hierarchical facilities. Part I
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- L Bach, 1980. "Locational Models for Systems of Private and Public Facilities Based on Concepts of Accessibility and Access Opportunity," Environment and Planning A, , vol. 12(3), pages 301-320, March.
- Calvo, Alberto B. & Marks, David H., 1973. "Location of health care facilities: An analytical approach," Socio-Economic Planning Sciences, Elsevier, vol. 7(5), pages 407-422, October.