Immersed boundary smooth extension: A high-order method for solving PDE on arbitrary smooth domains using Fourier spectral methods. - David B. Stein; Robert D. Guy; Becca Thomases (J. Comput. Phys., 2016)

Immersed Boundary Smooth Extension (IBSE): A high-order method for solving incompressible flows in arbitrary smooth domains. - David B. Stein; Robert D. Guy; Becca Thomases (J. Comput. Phys., 2017)