TY  - RPRT
TI  - Amplification without inversion: The double- Lambda scheme.
AU  - O Kocharovskaya
AU  - P Mandel
PY  - 1990
DO  - 10.1103/physreva.42.523
UR  - https://pubmed.ncbi.nlm.nih.gov/9903830/
ID  - 9903830
ER  -