TY  - RPRT
TI  - Inversionless laser from a closed multilevel system.
AU  - Y Zhu
AU  - OC Mullins
AU  - M Xiao
PY  - 1993
DO  - 10.1103/physreva.47.602
UR  - https://pubmed.ncbi.nlm.nih.gov/9908955/
ID  - 9908955
ER  -