Y. S. Oladyshkin, N.N. Bobkov, and O. Kozyrev. page 9. N. Novgorod, Russia, The VII computer-based conference «Information technologies in science, designing and manufacture», (2002)
O. Cirpka, and W. Nowak. Bridging the Gap between Measurement and Modeling in Heterogeneous Media, Lawrence Berkeley Laboratory, University of California, Berkeley, CA. USA, International Groundwater Symposium, (March 2002)