@misc{indiciae4ecda6a13ce5,
  title = {Possible variations in atmospheric methane},
  author = {Chameides, W. L. and Liu, S. C. and Cicerone, R. J.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770048043},
  note = {Source identifier: 19770048043}
}