@article{Ai:2022Q/, author = "Ai, Wen-Yuan and Cruz, Juan S. and Garbrecht, Bjoern and Tamarit, Carlos", title = "{The limits of the strong CP problem}", doi = "10.22323/1.405.0084", journal = "PoS", year = 2022, volume = "DISCRETE2020-2021", pages = "084" }