Khaleel Faraj A, Hadi M. On Symmetric Higher (U, R)-n-Derivation of Prime Rings . QJPS [Internet]. 2020Mar.31 [cited 2026Jan.18];25(2):Math.40-50. Available from: https://www.journalsc.qu.edu.iq.51-77-64-103.cpanel.site/index.php/JOPS/article/view/1056