@misc{indiciaed66668f981f7,
  title = {Radio-tracer techniques for the study of flow in saturated porous materials},
  author = {H.E. Skibitzke and H. T. Chapman and G.M. Robinson and Richard A. McCullough},
  year = {1961},
  doi = {10.1016/0020-708x(61)90006-0},
  url = {https://pubs.usgs.gov/publication/70009802},
  note = {Source identifier: 70009802}
}