@misc{indiciae14d6d3655642,
  title = {Spectrum of class-M supergiants in the region lambda lambda 7000-6000 angstrom},
  author = {Orlov, M. Y. and Rodriguez, M. H. and Shavrina, A. V.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730021119},
  note = {Source identifier: 19730021119}
}