1. An algoithmic approach to network location problems, I. The p-centers;Kariv;SIAM J. Appl. Math.,1979
2. An algoithmic approach to network location problems, II. The p-medians;Kariv;SIAM J. Appl. Math.,1979
3. Optimal center location in simple networks;Goldman;Transp. Sci.,1971
4. Application of mathematical models to wheat harvesting;Hua;Chin. Math.,1962
5. Location Theory - A Unified Approach;Nickel,2005