Sitorus, Clara Magdalena, and Elvina Herawati. “Fixed Point of Contractive Mappings in Cone Metric Space: Titik Tetap Dari Fungsi Kontraktif Pada Ruang Metrik Cone”. Journal of Mathematics Technology and Education 1, no. 3 (June 3, 2022): 257-268. Accessed April 29, 2024. https://talenta.usu.ac.id/jomte/article/view/9766.