Adriyanto, Oscar, and Halim Agung. “Edge Detection to Indication Brain Tumor Using Sobel and Morphological Operations Methods Based on Image Magnetic Resonance Imaging”. CESS (Journal of Computer Engineering, System and Science) 3, no. 2 (August 1, 2018): 179–185. Accessed June 7, 2025. https://jurnal.unimed.ac.id/2012/index.php/cess/article/view/10024.