Paper A: Applied Mathematics Letters 22(8), Keilegavlen, E.; Nordbotten, J. M.; Aavatsmark, I., Sufficient criteria are necessary for monotone control volume methods, pp. 1178-1180. Copyright 2009 Elsevier. Full text not available in BORA due to publisher restrictions. The published version is available at: http://dx.doi.org/10.1016/j.aml.2009.01.048Paper B: Computational Geosciences 15(1), Keilegavlen, E.; Aavatsmark, I., Monotonicity for MPFA methods on triangular grids, pp. 3-16. Copyright 2010 Springer Science+Business Media. Full text not available in BORA due to publisher restrictions. The published version is available at: http://dx.doi.org/10.1007/s10596-010-9191-5Paper C: Ocean Modelling 28(4), Keilegavlen, E.; Berntsen, J., Non-hydrostatic pressure in sigma-coordinate ocean models, pp. 240-249. Copyright 2009 Elsevier. Full text not available in BORA due to publisher restrictions. The published version is available at: http://dx.doi.org/10.1016/j.ocemod.2009.02.006Paper D: Computational Geosciences 14(4), Mundal, S. S.; Keilegavlen, E.; Aavatsmark, I., Simulation of Anisotropic Heterogeneous Near-well Flow using MPFA Methods on Flexible Grids, pp. 509-525. Copyright 2009 Springer Science+Business Media. Full text not available in BORA due to publisher restrictions. The published version is available at: http://dx.doi.org/10.1007/s10596-009-9167-5Paper E: Keilegavlen, E.; Kozdon, J.; Mallison, B., 2010, Multi-dimensional upstream weighting on general grids for flow in porous media. Full text not available in BORA.Paper F (related publication): Keilegavlen, E.; Aavatsmark, I., Monotonicity for control volume methods on unstructured grids. In: Proceedings of the 11th European Conference on the Mathematics of Oil Recovery, Bergen, Norway, 8-11 September 2008. Copyright the authors. Reproduced with permission. Published version.