@article {1076411,
	title = {Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion},
	journal = {Optics Letters},
	volume = {42},
	number = {14},
	year = {2017},
	pages = {2818-2821},
	url = {https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-14-2818},
	author = {Lin, Zin and Lon{\v c}ar, Marko and Alejandro W. Rodriguez}
}
