@conference {sheng2015optical,
	title = {Optical gravitational collimation and observation of Einstein{\textquoteright}s rings in transformation optics},
	booktitle = {2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP)},
	year = {2015},
	pages = {32{\textendash}33},
	publisher = {IEEE},
	organization = {IEEE},
	author = {Sheng, Chong and Liu, Hiu and Zhu, Shining and Bekenstein, Rivka and Segev, Mordechai}
}
