TY  - RPRT
TI  - Population trapping in two-level models: Spectral and statistical properties.
AU  - JI Cirac
AU  - LL Sánchez-Soto
PY  - 1991
DO  - 10.1103/physreva.44.3317
UR  - https://pubmed.ncbi.nlm.nih.gov/9906332/
ID  - 9906332
ER  -