Bijoy Mandal, Arindam Biswas, Swarup Samanta & A. K. Bhattacharjee “Intrinsic Localized Modes in Metamaterials” Advances in Optical Science and Engineering , Part of the Springer Proceedings in Physics book series Volume 166, pp 549–556 DOI: 10.1007/978-81-322-2367-2_67