SALIH, Salah Mahdi; SHAKER, Samah Jaber. Orthogonal Generalized Symmetric Higher bi-Derivations on Semiprime ?-Rings .. Iraqi Journal of Science, [S.l.], p. 711-723, apr. 2018. ISSN 2312-1637. Available at: <http://scbaghdad.edu.iq/eijs/index.php/eijs/article/view/276>. Date accessed: 25 apr. 2019.