@article {Carena:2019nnd,
	title = {$ν$ solution to the strong CP problem},
	journal = {Phys. Rev. D},
	volume = {100},
	number = {9},
	year = {2019},
	pages = {094018},
	doi = {10.1103/PhysRevD.100.094018},
	author = {Carena, Marcela and Da Liu and Jia Liu and Shah, Nausheen R. and Wagner, Carlos E. M. and Wang, Xiao-Ping}
}
