1. The Uncapacitated Facility Location Problem. Ch.3, Discrete Location Theory;Cornuejols,1990
2. Graph Theory: An Algorithmic Approach;Christofides,1975
3. Extremal Standardization Problems;Beresnev,1978
4. Requirements of Standards: Optimization Models and Algorithms;Goldengorin,1995
5. Specially Structured Uncapacitated Facility Location Problems;Jones;Operations Research,1995