Robert S. Laramee, Robert Kosara. Challenges and Unsolved Problems. In Andreas Kerren, Achim Ebert, Jörg Meyer, editors, Human-Centered Visualization Environments, GI-Dagstuhl Research Seminar, Dagstuhl Castle, Germany, March 5-8, 2006, Revised Lectures. Volume 4417 of Lecture Notes in Computer Science, pages 231-254, Springer, 2006. [doi]
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