Khazaeli, Farhad, Arman, Hosein, Zare, Mohammadreza. “Combination of Data Envelopment Analysis and Non-Linear Programming: A Novel Hybrid for Optimizing the Allocation of the Fixed-Cost in the Project Portfolio.” International Journal of Data Envelopment Analysis, vol. 8, no. 4, 2020, pp. 39-54.