TY  - RPRT
TI  - Variational principles for nonsmooth metrics.
AU  - G Hayward
AU  - J Louko
PY  - 1990
DO  - 10.1103/physrevd.42.4032
UR  - https://pubmed.ncbi.nlm.nih.gov/10012814/
ID  - 10012814
ER  -