Kevin Buchin Sergio Cabello Joachim Gudmundsson Maarten Löffler Jun Luo Günter Rote Rodrigo I. Silveira Bettina Speckmann Thomas Wolle Detecting Hotspots in Geographic Networks. 217-231 2009 AGILE Conf. http://dx.doi.org/10.1007/978-3-642-00318-9_11 conf/agile/2009 db/conf/agile/agile2009.html#BuchinCGLLRSSW09