TY  - RPRT
TI  - Quantum Einstein-Maxwell fields: A unified viewpoint from the loop representation.
AU  - R Gambini
AU  - J Pullin
PY  - 1993
DO  - 10.1103/physrevd.47.r5214
UR  - https://pubmed.ncbi.nlm.nih.gov/10015590/
ID  - 10015590
ER  -