Petteri Nurmi Eemil Lagerspetz Wray L. Buntine Patrik Floréen Joonas Kukkonen Product retrieval for grocery stores. 781-782 2008 SIGIR http://doi.acm.org/10.1145/1390334.1390501 conf/sigir/2008 db/conf/sigir/sigir2008.html#NurmiLBFK08