Kassa, Abay Molla, and Semu Mitiku Kassa. 2013. “A Multi-Parametric Programming Algorithm for Special Classes of Non-Convex Multilevel Optimization Problems”. An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 3 (2):133-44. https://doi.org/10.11121/ijocta.01.2013.00156.