TY  - RPRT
TI  - Lasing without inversion in a closed three-level system.
AU  - Y Zhu
PY  - 1992
DO  - 10.1103/physreva.45.r6149
UR  - https://pubmed.ncbi.nlm.nih.gov/9907829/
ID  - 9907829
ER  -