@misc{indiciaec97043182496,
  title = {Adhesion between atomically pure metallic surfaces, part 4 Semiannual report},
  author = {Keller, D. V., Jr. and Mc Nicholas, T.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680008185},
  note = {Source identifier: 19680008185}
}