@misc{indiciaeb47def134e5b,
  title = {Study of optical properties and collective oscillations in new solid-state materials as a function of temperature using infrared and Raman techniques Semiannual report, 1 Feb. - 31 Jul. 1968},
  author = {Perry, C. H.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680072938},
  note = {Source identifier: 19680072938}
}