Helwig Hauser Stephen G. Kobourov Huamin Qu 2012 IEEE Pacific Visualization Symposium, PacificVis 2012, Songdo, Korea (South), February 28 - March 2, 2012 IEEE 2012 978-1-4673-0863-2 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=6178307 PacificVis db/conf/apvis/pacificvis2012.html