TY  - RPRT
TI  - Even-harmonic generation in free-electron lasers.
AU  - MJ Schmitt
AU  - CJ Elliott
PY  - 1986
DO  - 10.1103/physreva.34.4843
UR  - https://pubmed.ncbi.nlm.nih.gov/9897870/
ID  - 9897870
ER  -