Ahmad Khairul Umam, and Krisna Adilia Daniswara. 2022. “TITIK TETAP REICH DI DALAM RUANG B-METRIK”. Jurnal Matematika Dan Sains (JMS) 2 (2). Lamongan, Indonesia:217-22. https://doi.org/10.552273/jms.v2i02.175.