*: Viegas, Fernanda B. et al.: Studying cooperation and conflict between authors with history flow visualizations. In: Proceedings of the 2004 conference on Human factors in computing systems. New Xork: ACM Press, 2004. S. 575-582. http://doi.acm.org/10.1145/985692.985765
unter dem Link habe ich nichts gefunden. http://web.media.mit.edu/~fviegas/papers/history_flow.pdf scheints aber zu sein