Wu, Xiaodong, and Michael Merickel. “Simultaneous Border Segmentation of Doughnut-Shaped Objects in Medical Images”. Journal of Graph Algorithms and Applications 11, no. 1 (January 1, 2007): 215–237. Accessed December 23, 2024. https://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper143.