El-Halwagi, M. M., F. Gabriel, and D. Harell, (2003) “Rigorous Graphical Targeting for Resource Conservation via Material Recycle/Reuse Networks”, Ind. Eng.
El-Halwagi, M. M., F. Gabriel, and D. Harell, (2003) “Systematic Visual Planning for Waste Reduction through Recycling and Reuse Systems”, Industrial Engineering