Yan Xu Mirjana Spasojevic Jiang Gao Matthias Jacob Designing a vision-based mobile interface for in-store shopping. 393-402 2008 NordiCHI http://doi.acm.org/10.1145/1463160.1463203 conf/nordichi/2008 db/conf/nordichi/nordichi2008.html#XuSGJ08