Svyatskiy, Daniil, and Konstantin Lipnikov. “Second-Order Accurate Finite Volume Schemes With the Discrete Maximum Principle for Solving Richards’ Equation on Unstructured Meshes”. Advances in Water Resources, vol. 104, 2017, pp. 114-26, https://doi.org/10.1016/j.advwatres.2017.03.015.