@misc{indiciae9b1267eeea0b,
  title = {A new technique for pumping hydrogen gas},
  author = {I. Friedman and K. Hardcastle},
  year = {1970},
  doi = {10.1016/0016-7037(70)90156-0},
  url = {https://pubs.usgs.gov/publication/70010121},
  note = {Source identifier: 70010121}
}