TY  - RPRT
TI  - A numerical solution for the diffusion equation in hydrogeologic systems
AU  - A. L. Ishii
AU  - R. W. Healy
AU  - Robert G. Striegl
PY  - 1989
DO  - 10.3133/wri894027
UR  - https://pubs.usgs.gov/publication/wri894027
ID  - wri894027
ER  -