TY  - RPRT
TI  - Extrinsic time in quantum cosmology.
AU  - SC Beluardi
AU  - R Ferraro
PY  - 1995
DO  - 10.1103/physrevd.52.1963
UR  - https://pubmed.ncbi.nlm.nih.gov/10019417/
ID  - 10019417
ER  -