Patty, Henry, Elvinus Persulessy, and RUDY Matakupan. “KARAKTERISASI ELEMEN IDEMPOTEN CENTRAL”. BAREKENG: Jurnal Ilmu Matematika dan Terapan 5, no. 1 (March 1, 2011): 33-39. Accessed April 18, 2024. https://ojs3.unpatti.ac.id/index.php/barekeng/article/view/184.