TY  - RPRT
TI  - Application of the conjugate-gradient method to ground-water models
AU  - T.A. Manteuffel
AU  - D.B. Grove
AU  - Leonard F. Konikow
PY  - 1984
DO  - 10.3133/wri834009
UR  - https://pubs.usgs.gov/publication/wri834009
ID  - wri834009
ER  -