@inbook{12510, author = {E. Gundersen and Hans Langtangen}, title = {Finite Element Methods for Two-Phase Flow in Heterogeneous Porous Media}, year = {1997}, journal = {Numerical Methods and Software Tools in Industrial Mathematics}, publisher = {Birkh{\"a}user}, editor = {M. D{\ae}hlen and Aslak Tveito}, }