This research was published in
Physical Review Letters, a journal of the American Physical Society, online on June 3, 2015. (Long-Hua Wu and
Xiao Hu, Title: Scheme for Achieving a Topological Photonic Crystal by Using Dielectric Material, Phys. Rev. Lett.114, 223901 – Published 3 June 2015, DOI:*
http://dx.doi.org/10.1103/PhysRevLett.114.223901)