Daniel Bauer Pierre Fastrez James D. Hollan Computationally-Enriched 'Piles' for Managing Digital Photo Collections. 193-195 2004 conf/vl/2004 VL/HCC http://doi.ieeecomputersociety.org/10.1109/VLHCC.2004.13 db/conf/vl/vlhcc2004.html#BauerFH04