Equal-thickness invisible cloaks for arbitrarily polygonal-cylindrical regions W. X. Jiang, T. J. Cui, J. Y. Chin, Q. Cheng, G. X. Yu, X. M. Yang and R. Liu Eur. Phys. J. Appl. Phys., 46 2 (2009) 20702 Published online: 03 April 2009 DOI: 10.1051/epjap/2009059