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Siddique, N., Paheding, S., Elkin, C. P., & Devabhaktuni, V. (2021). U-Net and Its Variants for Medical Image Segmentation: A Review of Theory and Applications. IEEE Access, 9, 82031–82057. doi:10.1109/access.2021.3086020 
10.1109/access.2021.3086020
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