@ARTICLE {6381,
author={O. Luukkonen and S. Maslovski  and A. Tretyakov},
doi={10.1109/LAWP.2011.2175897},
journal={IEEE Antennas and Wireless Propagation Letters},
title={A stepwise Nicolson-Ross-Weir-based material parameter extraction method},
year={2011},
month={November},
volume={10},
number={1},
pages={1295-1298},
ISSN={1536-1225}
}