1. Hillier F. S. and Lieberman G. J. (1990). Introduction to operations research . McGraw‐Hill New York N.Y.
2. Optimal Scheduling of Consecutive Landfill Operations with Recycling
3. Lawver R. A. and Lund J. R. (1992). “Planning centralized materials recovery facilities.” Linaweaver ed. WATER FORUM: environmental engineering ASCE August.
4. Lawver R. A. Lund J. R. and Tchobanoglous G. (1990). “GIGO—a solid waste management model for municipalities.” W. K. Shieh ed. Proc. 6th Int. Conf. on Solid Waste Mgmt. and Secondary Mat. University of Pennsylvania Philadelphia Pa.