TY  - RPRT
TI  - Nonlinear least-squares inversion of bipole-bipole direct-current data (program NLSBPBP)
AU  - W.L. Anderson
PY  - 1987
DO  - 10.3133/ofr8795
UR  - https://pubs.usgs.gov/publication/ofr8795
ID  - ofr8795
ER  -