M. Ferris, and D. Shepard. Discrete Mathematical Problems with Medical Applications, volume 55 of DIMACS Series in Discrete Mathematics and Theoretical Computer Science, page 27-43. DIMACS/AMS, (1999)
L. Shepard, A. Siddiqui, K. Snyder, E. Levy, J. Davies, and C. Ionita. Medical Imaging: Biomedical Applications in Molecular, Structural, and Functional Imaging, volume 10953 of SPIE Proceedings, page 1095314. SPIE, (2019)