TY  - RPRT
TI  - Pin groups in physics.
AU  - C DeWitt-Morette
AU  - BS DeWitt
PY  - 1990
DO  - 10.1103/physrevd.41.1901
UR  - https://pubmed.ncbi.nlm.nih.gov/10012562/
ID  - 10012562
ER  -