@misc{indiciae2501226952ba,
  title = {Noncontaminating technique for making holes in existing process systems},
  author = {Hecker, T. P. and Czapor, H. P. and Giordano, S. M.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720000384},
  note = {Source identifier: 19720000384}
}