@misc{indiciaec1342e0b53ea,
  title = {The sun in time},
  author = {Sonett, Charles P. and Giampapa, Mark S. and Matthews, Mildred S.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920064040},
  note = {Source identifier: 19920064040}
}