A free tool visualizing scientific research areas and trends through timeline graphs and bar charts, allowing users to locate other experts in a field of study and browse article results.
J. Teevan, C. Alvarado, M. Ackerman, and D. Karger. CHI '04: Proceedings of the 2004 conference on Human factors in computing systems, page 415--422. ACM Press, (2004)
P. Eklund, J. Ducrou, and T. Wilson. Proceedings of the 4th International Confernce on Concept Lattices and Their Applications, Springer-Verlag, (October 2006)