TY  - RPRT
TI  - s-order positive quasiprobabilities: Nonlinear dynamics without divergences.
AU  - de Oliveira FA
PY  - 1992
DO  - 10.1103/physreva.45.3350
UR  - https://pubmed.ncbi.nlm.nih.gov/9907376/
ID  - 9907376
ER  -