TY  - RPRT
TI  - Positive-P representation for second-harmonic generation: Analytic and computational results.
AU  - KJ McNeil
AU  - IJ Craig
PY  - 1990
DO  - 10.1103/physreva.41.4009
UR  - https://pubmed.ncbi.nlm.nih.gov/9903574/
ID  - 9903574
ER  -