TY  - RPRT
TI  - Complex phase spaces and complex gauge groups in general relativity.
AU  - PG Bergmann
AU  - GJ Smith
PY  - 1991
DO  - 10.1103/physrevd.43.1157
UR  - https://pubmed.ncbi.nlm.nih.gov/10013486/
ID  - 10013486
ER  -