Papargyropoulou, E., Lozano, R., Steinberger, J. K., Wright, N., & bin Ujang, Z. (2014). The food waste hierarchy as a framework for the management of food surplus and food waste. Journal of cleaner production, 76, 106-115.
 Vittuari, M., De Menna, F., & Pagani, M. (2016). The hidden burden of food waste: the double energy waste in Italy. Energies, 9(8), 660.
 Pimentel, D., & Pimentel, M. H. (Eds.). (2007). Food, energy, and society. CRC press.
 Casimir, J. (2014). Food waste at the school level: a case study on a food waste reduction project within school restaurants in Uppsala, Sweden (Master Thesis, Uppsala University: Uppsala, Sweden). Retrieved from http://www.diva-portal.org/smash/get/diva2:742150/FULLTEXT01
 Silvennoinen, K., Heikkilä, L., Katajajuuri, J. M., & Reinikainen, A. (2015). Food waste volume and origin: Case studies in the Finnish food service sector. Waste management, 46, 140-145.
 Strotmann, C., Friedrich, S., Kreyenschmidt, J., Teitscheid, P., & Ritter, G. (2017). Comparing food provided and wasted before and after implementing measures against food waste in three healthcare food service facilities. Sustainability, 9(8), 1409.
 Derqui, B., Fernandez, V., & Fayos, T. (2018). Towards more sustainable food systems. Addressing food waste at school canteens. Appetite, 129, 1-11.
 Ali, A. Y., Hassen, J. M., & Wendem, G. G. (2019). Forecasting as a framework for reducing food waste in Ethiopian university canteens. J. Appl. Res. Ind. Eng, 6(4), 374-380.
 Schroeder, R. G., Linderman, K., Zaheer, S., & Choo, A. S. (2004). Six Sigma: a goal-theoretic perspective. Quality control and applied statistics, 49(1), 49-50.
 Schroeder, R. G., Linderman, K., Liedtke, C., & Choo, A. S. (2009). Six Sigma: definition and underlying theory. Quality control and applied statistics, 54(5), 441-445.
 Zu, X., Fredendall, L. D., & Douglas, T. J. (2008). The evolving theory of quality management: the role of Six Sigma. Journal of operations management, 26(5), 630-650.
 Kaushik, P., & Khanduja, D. (2009). Application of Six Sigma DMAIC methodology in thermal power plants: a case study. Total quality management, 20(2), 197-207.
 Antony, J., Kumar, M., & Tiwari, M. K. (2005). An application of Six Sigma methodology to reduce the engine-overheating problem in an automotive company. Proceedings of the institution of mechanical engineers, Part B: journal of engineering manufacture, 219(8), 633-646.
 Safwat, T., & Ezzat, A. (2008, December). Applying Six Sigma techniques in plastic injection molding industry. 2008 IEEE international conference on industrial engineering and engineering management (pp. 2041-2045). IEEE.
 Su, C. T., & Chou, C. J. (2008). A systematic methodology for the creation of Six Sigma projects: a case study of semiconductor foundry. Expert systems with applications, 34(4), 2693-2703.
 Jirasukprasert, P., Garza-Reyes, J. A., Soriano-Meier, H., & Rocha-Lona, L. (2012, July). A case study of defects reduction in a rubber gloves manufacturing process by applying Six Sigma principles and DMAIC problem solving methodology. Proceedings of the 2012 international conference on industrial engineering and operations management (pp. 3-6). Istanbul, Turkey.
 Hensley, R. L., & Dobie, K. (2005). Assessing readiness for six sigma in a service setting. Managing service quality: An international journal, 15(1), 82-101.
 Directive, E. C. (2008). Directive 2008/98/EC of the European parliament and of the council of 19 November 2008 on waste and repealing certain directives. Official journal of the European Union L, 312(3).
 Cunha, C., & Dominguez, C. (2015). A DMAIC project to improve warranty billing's operations: a case study in a Portuguese car dealer. Procedia computer science, 64, 885-893.
 Ali, A. Y., & Ayele, A. (2019). Contribution of quality tools for reducing food waste in university canteen. Journal of applied research on industrial engineering, 6(2), 125-130.
 Desai, D. A. (2012). Increasing bottom-line through Six Sigma quality improvement drive: case of small scale foundry industry. Udyog pragati, 36(2), 11-23.