@misc{indiciaeae278977d13c,
  title = {Phosphors with long-persistent green phosphorescence},
  author = {Yen, William M and Jia, Weiyi and Lu, Lizhu and Yuan, Huabiao},
  year = {2001},
  url = {https://ntrs.nasa.gov/citations/20080004883},
  note = {Source identifier: 20080004883}
}