TY  - RPRT
TI  - Generalized Riemann Spaces and General Relativity.
AU  - L P Eisenhart
PY  - 1953
DO  - 10.1073/pnas.39.6.546
UR  - https://pubmed.ncbi.nlm.nih.gov/16589302/
ID  - 16589302
ER  -