@misc{indiciaeff571c5e4159,
  title = {Trends in source gases},
  author = {Ehhalt, D. H. and Fraser, P. J. and Albritton, D. and Cicerone, R. J. and Khalil, M. A. K. and Legrand, M. and Makide, Y. and Rowland, F. S. and Steele, L. P. and Zander, R.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19920006242},
  note = {Source identifier: 19920006242}
}