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Doerner, Karl and Focke, Axel and Gutjahr, Walter (2007) "Multicriteria Tour Planning for Mobile Healthcare Facilities in a Developing Country". European Journal of Operational Research, 179 (3). pp. 1078-1096.
Stummer, Christian and Doerner, Karl and Focke, Axel and Heidenberger, Kurt (2004) Determining location and size of medical departments in a hospital network: A multiobjective decision support approach. Health Care Management Science (7). pp. 63-71.