Mahmood, D. A. and Muhammadali, M. A. (2025) “Hybrid U-Net Architectures with ResNet50 and VGG19 for Accurate CT-Based Kidney Disease and Stone Segmentation”, UHD Journal of Science and Technology, 9(2), pp. 231–250. doi: 10.21928/uhdjst.v9n2y2025.pp231-250.