Kyriakos Mouratidis Man Lung Yiu Dimitris Papadias Nikos Mamoulis Continuous Nearest Neighbor Monitoring in Road Networks. 43-54 2006 conf/vldb/2006 VLDB http://www.vldb.org/conf/2006/p43-mouratidis.pdf db/conf/vldb/vldb2006.html#MouratidisYPM06