@article {zhen2015spawning,
	title = {Spawning rings of exceptional points out of Dirac cones},
	journal = {Nature},
	volume = {525},
	year = {2015},
	pages = {354{\textendash}358},
	publisher = {Nature Publishing Group},
	author = {Zhen, Bo and Hsu, Chia Wei and Igarashi, Yuichi and Lu, Ling and Kaminer, Ido and Pick, Adi and Chua, Song-Liang and Joannopoulos, John D and Solja{\v c}i{\'c}, Marin}
}
