Dan Ancona Michael Freeston Terence R. Smith Sara Irina Fabrikant Visual Explorations for the Alexandria Digital Earth Prototype. 199-216 2002 conf/jcdl/2002vidl Visual Interfaces to Digital Libraries http://link.springer.de/link/service/series/0558/bibs/2539/25390199.htm db/conf/jcdl/vidl2002.html#AnconaFSF02