@misc{indiciaec2188c899012,
  title = {A miniature high frequency sphere probe},
  author = {Kerrebrock, J. L. and Epstein, A. H. and Thompkins, W. T., Jr.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800051964},
  note = {Source identifier: 19800051964}
}