1. T. A. Prickett, and C. G. Lonnquist, 1973 . Aquifer simulation model for use on disk supported small computer systems. Illinois State Water Survey, Circular 114, Urbana.
2. P. C. Trescott, G. F. Finder, and S. P. Larson, 1976 . Finite difference model for aquifer simulation in two dimensions with results of numerical experiments. Book 7, Chapter C1, Techniques of Water Resources Investigations of the U.S. Geological Survey, Reston, Virginia.