Kim Sang Wook, Kim Kang-Hwan, Sagawa Takahiro, De Liberato Simone, Ueda Masahito
Department of Physics Education, Pusan National University, Busan 609-735, Korea.
Phys Rev Lett. 2013 Nov 1;111(18):188902. doi: 10.1103/PhysRevLett.111.188902. Epub 2013 Oct 30.