Arizal Mujibtamala Nanda Imron, Zilvanhisna Emka Fitri, Azizatul Mashwafah, Wahyu Muldayani, and Sumardi, “Improvement of Preprocessing for Spiral and Wave Handwriting Image Classification Using DenseNet-169”, IJIE, vol. 17, no. 5, pp. 363–375, Aug. 2025, Accessed: Apr. 09, 2026. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/19791