@inproceedings{Swain:2013PE, author = "Swain, John", title = "{Black Holes and the Strong CP Problem}", doi = "10.22323/1.161.0049", booktitle = "Proceedings of VIII International Workshop on the Dark Side of the Universe {\textemdash} PoS(DSU 2012)", year = 2013, volume = "161", pages = "049" }