Triplet-state defect in high-purity silica glass.

@article{Tohmon1990TripletstateDI,
  title={Triplet-state defect in high-purity silica glass.},
  author={Tohmon and Shimogaichi and Tsuta and Munekuni and Ohki and Hama and Nagasawa},
  journal={Physical review. B, Condensed matter},
  year={1990},
  volume={41 10},
  pages={7258-7260}
}