Analysis of photonic band gaps in a two-dimensional photonic crystal with centrifugal core-shell rods H. Xiao, D. Z. Yao, C. X. Wang and S. Chen Eur. Phys. J. B, 64 2 (2008) 219-229 Published online: 30 July 2008 DOI: 10.1140/epjb/e2008-00307-6