Mousavi, S. M. ., Gerami, J. ., Mozaffari, M. R. ., Mohammadalipour Ahari, R. ., & Feylizadeh, M. R. . (2025). A Robust Directional Distance Function for Fixed-Sum Undesirable Outputs: A Petrochemical Industry Study. Annals of Optimization With Applications, 1(4), 241-268. https://doi.org/10.48314/anowa.v1i4.61