@misc{indiciae45a3fb1cb8d5,
  title = {Deciding When and How to Learn},
  author = {Gratch, J. and Dejong, G. and Chien, S.},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/20060037805},
  note = {Source identifier: 20060037805}
}