TY  - RPRT
TI  - An obstacle to building a time machine.
AU  - SM Carroll
AU  - E Farhi
AU  - AH Guth
PY  - 1992
DO  - 10.1103/physrevlett.68.263
UR  - https://pubmed.ncbi.nlm.nih.gov/10045847/
ID  - 10045847
ER  -