TY  - RPRT
TI  - Cosmological fluids as time variables in general relativity.
AU  - DS Salopek
AU  - JM Stewart
PY  - 1993
DO  - 10.1103/physrevd.47.3235
UR  - https://pubmed.ncbi.nlm.nih.gov/10015942/
ID  - 10015942
ER  -