Bahtiar, A. Rifqi, Muchammad Abrori, and Malahayati Malahayati. “Konsep Dasar Ruang Metrik Cone”. Jurnal Fourier 3, no. 2 (October 3, 2014): 115–129. Accessed February 2, 2026. https://fourier.or.id/index.php/FOURIER/article/view/45.