De Wilde, J., Heynderickx, G. J., Vierendeels, J., Dick, E., & Marin, G. B. (2002). An Extension of the Preconditioned Advection Upsream Splitting Method for 3D Two-Phase Flow Calculations in Circulating Fluidized Beds. Computers & Chemical Engineering, 26(12), 1677-1702. https://hdl.handle.net/2078.5/66227 (Original work published 2002)