TY  - RPRT
TI  - Method for constructing models with strong CP invariance.
AU  - PH Frampton
AU  - TW Kephart
PY  - 1991
DO  - 10.1103/physrevlett.66.1666
UR  - https://pubmed.ncbi.nlm.nih.gov/10043276/
ID  - 10043276
ER  -