S. Balak, M. H. Behzadi, and A. Nazari, “Comparison of the Dependence Structures of Stochastic Copula-DEA Model”, Fuzzy Optim. Model. J., vol. 2, no. 4, pp. 20–37, Nov. 2021, doi: 10.30495/fomj.2021.1943130.1041.