Hosein Zadeh Lotfi, Farhad, and Lorenzo Cevallos-Torres. “Efficiency Analysis of DMUs Based Separation Hyperplanes in PPS With VRS Technology to Deal With Interval Scale Data”. Research Annals of Industrial and Systems Engineering 1, no. 1 (August 15, 2024): 62–79. Accessed August 24, 2025. https://www.raise.reapress.com/journal/article/view/41.