Xiaoqian Jiang Wanhong Xu Latanya Sweeney Yiheng Li Ralph Gross Daniel Yurovsky New Directions in Contact Free Hand Recognition. 389-392 2007 ICIP (2) http://dx.doi.org/10.1109/ICIP.2007.4379174 conf/icip/2007 db/conf/icip/icip2007-2.html#JiangXSLGY07