TY  - RPRT
TI  - Nonlinear susceptibilities as a function of several complex angular-frequency variables.
AU  - K Peiponen
PY  - 1988
DO  - 10.1103/physrevb.37.6463
UR  - https://pubmed.ncbi.nlm.nih.gov/9943892/
ID  - 9943892
ER  -