Band structure of two-dimensional square lattice photonic crystals of circular dispersive metamaterial rodsA. Soltani Vala, S. Roshan Entezar and A. A. SedghiEur. Phys. J. B, 81 3 (2011) 269-274DOI: https://doi.org/10.1140/epjb/e2011-20192-0