TY  - RPRT
TI  - Inversionless amplification in a multilevel system.
AU  - P Mandel
AU  - O Kocharovskaya
PY  - 1993
DO  - 10.1103/physreva.47.5003
UR  - https://pubmed.ncbi.nlm.nih.gov/9909533/
ID  - 9909533
ER  -