Equal-thickness invisible cloaks for arbitrarily polygonal-cylindrical regionsW. X. Jiang, T. J. Cui, J. Y. Chin, Q. Cheng, G. X. Yu, X. M. Yang and R. LiuEur. Phys. J. Appl. Phys., 46 2 (2009) 20702DOI: https://doi.org/10.1051/epjap/2009059