Hotho, A., Jäschke, R., Schmitz, C. & Stumme, G. (2006). Trend detection in folksonomies. Proceedings of the First international conference on Semantic and Digital Media Technologies (p./pp. 56--70), Berlin, Heidelberg: Springer-Verlag. ISBN: 3-540-49335-2, 978-3-540-49335-8