@misc{indiciaee3f917e71ffe,
  title = {Further observations of BL Lacertae},
  author = {Thuan, T. X. and Oke, J. B. and Gunn, J. E.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19760029612},
  note = {Source identifier: 19760029612}
}