@book{33130,
	author = {Roychoudhuri, Chandrasekhar, ed.},
	title = {The Nature of Light: What are Photons? VI},
	publisher = {SPIE},
	year = {2015},
	series = {Proceedings of SPIE; V. 9570},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9570}
}