@article{11038,
  author = {L. Holden and Bj{\o}rn Nielsen},
  title = {Global Upscaling of Permeability in Heterogeneous Reservoirs; the Output Least Squares (OLS) Method},
  year = {2000},
  journal = {Transport in Porous Media},
  volume = {40},
  number = {2},
  pages = {115-143,},
}