TY  - RPRT
TI  - The U.S. Geological Survey Modular Ground-Water Model - PCGN: A Preconditioned Conjugate Gradient Solver with Improved Nonlinear Control
AU  - Richard L. Naff
AU  - Edward R. Banta
PY  - 2008
DO  - 10.3133/ofr20081331
UR  - https://pubs.usgs.gov/publication/ofr20081331
ID  - ofr20081331
ER  -