1. Andrei A, Radu M, Andrei L (2010) Homogenization of metamaterials: parameters retrieval methods and intrinsic problems. Proce Inter Conf Transparent Optical Networks Mo B2(1):1–5
2. Barroso JJ, Hasar UC (2012) Comments on ‘a unique extraction of metamaterial parameters based on Kramers-Kronig relationship. IEEE Transact Microwave Theory Tech 60:1743–1744
3. Caloz C, Itoh T (2006) Electromagnetic metamaterials: Transmission line theory and microwave applications. IEEE Press, John Wiley & Sons Inc
4. Capolino F (2009) Theory and phenomenon of metamaterials. CRC Press, Taylor & Francis Group, Metamaterials Handbook
5. Chen X, Grzegorczyk TM, Wu B-I, Pacheco J, Kong JA (2004a) Robust method to retrieve the constitutive effective parameters of metamaterials. Phys Rev 70:01660(1-7)