Arifin, Agus Zainal, Aidila Fitri Fitri Heddyanna, and Hudan Studiawan. “Ultrafuzziness Optimization Based on Type II Fuzzy Sets for Image Thresholding”. Journal of ICT Research and Applications 4, no. 2 (November 1, 2010): 79-94. Accessed October 7, 2025. https://journals.itb.ac.id/index.php/jictra/article/view/642.