Jing Yang Matthew O. Ward Elke A. Rundensteiner Anilkumar Patro InterRing: a visual interface for navigating and manipulating hierarchies. 16-30 2003 2 Information Visualization 1 http://dx.doi.org/10.1057/palgrave.ivs.9500035 db/journals/ivs/ivs2.html#YangWRP03