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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.094802
http://science.sciencemag.org/content/357/6352/645
http://iopscience.iop.org/article/10.1088/1367-2630/15/11/113053/meta
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-37-23-4949
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-38-24-5418
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