1. Standard Nasional Indonesia No. 19-3983-1995, 1995.
2. Standard Nasional Indonesia No 19-2454-2002, 2002.
3. Amponsah, S Kwalme, Salhi and Said, “The investigation of a class of capacitated arc routine problems: the collection of garbage in developing countries,” Integrated Waste Management. 4 (7), 711–721, 2004.
4. O Apaydin, “Geographical information system (GIS) supported optimization of solid waste Management alternatives in Trabzon City,” Ph.D. Thesis, Yildiz Technical University, 2004.
5. O. Apaydin, E. Arslankaya, Y. Avsar and M.T. Gonullu, “GIS supported optimization of solid waste collection: Trabzon case study,”, Sigma, 4: 249–254, 2004.