Xiaohai Wan Wan, X. H., & Li, Z. (2012). Some new finite difference methods for Helmholtz equations on irregular domains or with interfaces. Discrete and Continuous Dynamical Systems-Series B, 17(4), 1155–1174. https://doi.org/10.3934/dcdsb.2012.17.1155 Wan, X. H., Li, Z., & Lubkin, S. R. (2008). Mechanics of mesenchymal contribution to clefting force in branching morphogenesis. Biomechanics and Modeling in Mechanobiology, 7(5), 417–426. https://doi.org/10.1007/s10237-007-0105-y Li, Z. L., Wan, X. H., Ito, K., & Lubkin, S. R. (2006). An augmented approach for the pressure boundary condition in a Stokes flow. Communications in Computational Physics, 1(5), 874–885. Lubkin, S., & Wan, X. (2006). Optimizing detection of tissue anisotropy by fluorescence recovery after photobleaching. Bulletin of Mathematical Biology, 68(8), 1873–1891. https://doi.org/10.1007/s11538-006-9074-z