G. Tohidi and P. Valizadeh, “A NON-RADIAL ROUGH DEA MODEL”, Int. J. Math. Model. Comput., vol. 1, no. 4, pp. 257–261, Sep. 2011, Accessed: May 10, 2026. [Online]. Available: http://oiccpress.com/ijm2c/article/view/11058