Invasion percolation in correlated porous media A. M. Vidales, E. Miranda, M. Nazzarro, V. Mayagoitia, F. Rojas and G. Zgrablich Europhys. Lett., 36 4 (1996) 259-264 Published online: 01 September 2002 DOI: 10.1209/epl/i1996-00219-7