@article {Yang2017-kc,
	title = {Counter-propagating solitons in microresonators},
	journal = {Nature Photonics},
	volume = {11},
	number = {9},
	year = {2017},
	pages = {560{\textendash}564},
	publisher = {Springer Science and Business Media LLC},
	abstract = {Counter-propagating solitons are generated in microresonator systems, producing dual-soliton frequency-comb streams with different repetition rates but high relative coherence useful for spectroscopy and laser ranging systems.},
	url = {https://www.nature.com/articles/nphoton.2017.117},
	author = {Yang, Qi-Fan and Yi, Xu and Yang, Ki Youl and Vahala, Kerry}
}
