BibTex format
@article{Kraft:2014:10.1103/PhysRevB.89.245125,
author = {Kraft, M and Pendry, JB and Maier, SA and Luo, Y},
doi = {10.1103/PhysRevB.89.245125},
journal = {PHYSICAL REVIEW B},
title = {Transformation optics and hidden symmetries},
url = {http://dx.doi.org/10.1103/PhysRevB.89.245125},
volume = {89},
year = {2014}
}