S. Blank Yantao Shen Ning Xi Chi Zhang Uchechukwu C. Wejinya High precision PSD guided robot localization: Design, mapping, and position control. 52-57 2007 IROS http://dx.doi.org/10.1109/IROS.2007.4399621 conf/iros/2007 db/conf/iros/iros2007.html#BlankSXZW07