TY  - RPRT
TI  - Photon number density operator iE-circumflex
AU  - M Hawton
AU  - T Melde
PY  - 1995
DO  - 10.1103/physreva.51.4186
UR  - https://pubmed.ncbi.nlm.nih.gov/9912094/
ID  - 9912094
ER  -