@article{sun2011multiscale,
  title={Multiscale method for characterization of porous microstructures and their impact on macroscopic effective permeability},
  author={Sun, WaiChing and Andrade, Jose E and Rudnicki, John W},
  journal={International Journal for Numerical Methods in Engineering},
  volume={88},
  number={12},
  pages={1260--1279},
  year={2011},
  publisher={Wiley Online Library}
}