Budi Surodjo, and Saifullah Ali. “Struktur Subring Deret Pangkat Tergeneralisasi Sebagai Himpunan Matriks Berindeks Monoid”. Limits: Journal of Mathematics and Its Applications 21, no. 2 (July 15, 2024): 191–200. Accessed January 24, 2026. https://journal.its.ac.id/index.php/limits/article/view/5502.