@misc{indiciaea51a155689ce,
  title = {Inducing in situ, nonlinear soil response applying an active source},
  author = {P.A. Johnson and P. Bodin and J. Gomberg and F. Pearce and Z. Lawrence and F.-Y. Menq},
  year = {2009},
  doi = {10.1029/2008jb005832},
  url = {https://pubs.usgs.gov/publication/70034691},
  note = {Source identifier: 70034691}
}