TY - RPRT TI - Solution of three-dimensional groundwater flow equations using the strongly implicit procedure AU - P.C. Trescott AU - S. P. Larson PY - 1977 DO - 10.1016/0022-1694(77)90076-2 UR - https://pubs.usgs.gov/publication/70009876 ID - 70009876 ER -