Salih, S. M., and S. J. Shaker. “Orthogonal Generalized Symmetric Higher Bi-Derivations on Semiprime Г-Rings .”. Iraqi Journal of Science, Vol. 59, no. 2A, Apr. 2018, pp. 711-23, https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/276.