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MR2073519 (2005b:90066) Suárez-Vega, R.; Santos-Peñate, D. R.; Dorta-González, P. Discretization and resolution of the $(r\vert X\sb p)$-medianoid problem involving quality criteria. Top 12 (2004), no. 1, 111--133. (Reviewer: Sandra L. Arlinghaus) 90B85