@misc{indiciae501b3685e42b,
  title = {Gravitational lensing effects in a time-variable cosmological 'constant' cosmology},
  author = {Ratra, Bharat and Quillen, Alice},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930037249},
  note = {Source identifier: 19930037249}
}