The equity theory: a quantitative perspective using data envelopment analysisParto Ahmadpour-Samani, Hosein Arman, Amirali Foukerdi, Abdollah Hadi-Vencheh and Reza Kiani MaviRAIRO-Oper. Res., 56 5 (2022) 3711-3732DOI: https://doi.org/10.1051/ro/2022178