TY  - RPRT
TI  - Path integrals and instantons in quantum gravity: Minisuperspace models.
AU  - D Marolf
PY  - 1996
DO  - 10.1103/physrevd.53.6979
UR  - https://pubmed.ncbi.nlm.nih.gov/10019984/
ID  - 10019984
ER  -