E. André, J. Müller, and T. Rist. MULTIMEDIA '96: Proceedings of the fourth ACM international conference
on Multimedia, page 407--408. New York, NY, USA, ACM Press, (1996)
M. Weiss-Lijn, J. MacDonnell, and L. James. chapter Interactive Visualization of Paragraph-level Metadata to Support
Corporate Document Use, page 116--134. Springer, (2003)