@misc{indiciae67eb2fb5a0a0,
  title = {A multi-channel digital telemetry system for low frequency geophysical data},
  author = {J. Roger and M.J.S. Johnston and C. Mortensen and G. Myren},
  year = {1977},
  doi = {10.3133/ofr77490},
  url = {https://pubs.usgs.gov/publication/ofr77490},
  note = {Source identifier: ofr77490}
}