Ebrahim, Hassan Hussien, and Rusul Abd Al_salam Ali. “λ–Algebra With Some of Their Properties”. Ibn AL-Haitham Journal For Pure and Applied Sciences 33, no. 2 (April 20, 2020): 72–80. Accessed May 1, 2025. https://www.jih.uobaghdad.edu.iq/index.php/j/article/view/2428.