TY  - RPRT
TI  - Lambda -type lasers and masers: Lasing without inversion and a vector model.
AU  - N Lu
PY  - 1992
DO  - 10.1103/physreva.45.5011
UR  - https://pubmed.ncbi.nlm.nih.gov/9907585/
ID  - 9907585
ER  -