@ARTICLE {6681,
author={J. Costa and M. G. Silveirinha},
doi={10.1364/OE.20.013915},
journal={Optics Express},
title={Achromatic lens based on a nanowire material with  anomalous dispersion },
year={2012},
month={June},
volume={20},
number={13},
pages={13915-13922},
ISSN={1094-4087}
}