TY  - RPRT
TI  - Lasers without inversion: Two-photon stimulated emission in a three-level atom.
AU  - C Mavroyannis
PY  - 1992
DO  - 10.1103/physreva.46.r6785
UR  - https://pubmed.ncbi.nlm.nih.gov/9908083/
ID  - 9908083
ER  -