Boiger, G, M Mataln, and W Brandstätter. 2009. “Simulation of Filtration Processes in Deformable Media Part 3.1: Basic Concepts and Particle-Fluid Force Implementation of a Non-Spherical Dirt Particle Solver”. The International Journal of Multiphysics 3 (4):407-32. https://doi.org/10.1260/1750-9548.3.4.407.