TY  - RPRT
TI  - Documentation of computer program VS2D to solve the equations of fluid flow in variably saturated porous media
AU  - E.G. Lappala
AU  - R. W. Healy
AU  - E.P. Weeks
PY  - 1987
DO  - 10.3133/wri834099
UR  - https://pubs.usgs.gov/publication/wri834099
ID  - wri834099
ER  -