"Partially spatial coherent thermal emitter based on an epsilon-and-mu-near-zero metamaterial"
Byungsoo Kang, Mingeon Kim, Junyong Seo, Jongin Choi, Van Long Le, Yong Jai Cho, Young Dong Kim, Bong Jae Lee, Bumki Min, Journal of the Korean Physical Society, Published, 76, 889–894