Anthony Collins Trent Apted Judy Kay Tabletop File System Access: Associative and Hierarchical Approaches. 113-120 2007 Tabletop http://doi.ieeecomputersociety.org/10.1109/TABLETOP.2007.34 conf/tabletop/2007 db/conf/tabletop/tabletop2007.html#CollinsAK07