Wardati, Khurul, Indah Emilia Wijayanti, and Sri Wahyuni. “ON FREE IDEALS IN FREE ALGEBRAS OVER A COMMUTATIVE RING”. Journal of the Indonesian Mathematical Society 21, no. 1 (April 25, 2015): 59–69. Accessed November 21, 2024. https://jims-a.org/index.php/jimsa/article/view/170.