Global upscaling of permeability in heterogeneous reservoirs; The output least squares (OLS) method Lars Holden Bjørn Fredrik Nielsen Publication details Journal: Transport in Porous Media, vol. 40, p. 115–143, 2000 Publisher: Springer International Standard Numbers: Printed: 0169-3913 Electronic: 1573-1634 Lars Holden Research Director You are here: Home Publications Scientific article Global upscaling of permeability in heterogeneous reservoirs; The output least squares (OLS) method