TY  - RPRT
TI  - Gravitons and loops.
AU  - A Ashtekar
AU  - C Rovelli
AU  - L Smolin
PY  - 1991
DO  - 10.1103/physrevd.44.1740
UR  - https://pubmed.ncbi.nlm.nih.gov/10014054/
ID  - 10014054
ER  -