@ARTICLE {7069,
author={M. Cascalheira and P. Pinho and N.B.C. Carvalho},
doi={10.1049/iet-map.2011.0610},
journal={IET Microwaves, Antennas and Propagation},
title={Indoor Guidance System for the Blind and the Visually Impaired},
year={2012},
month={July},
volume={6},
number={10},
pages={1149-1157},
ISSN={1751-8725}
}