@misc{indiciae6a12622914f5,
  title = {Interstellar extinction by quartz grains.},
  author = {Swamy, K. S. K. and Wickramasinghe, N. C.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680044095},
  note = {Source identifier: 19680044095}
}