Ingamita, Yevie, Nelson Nainggolan, and Benny Pinontoan. “Region Coloring in Minahasa Regency Using Sequential Color Algorithm”. d’Cartesian 8, no. 2 (July 25, 2019): 86–91. Accessed May 13, 2024. https://ejournal.unsrat.ac.id/v3/index.php/decartesian/article/view/23956.