@conference {DBLP:conf/ssdbm/QinYDI08,
	title = {{M}onitoring {A}ggregate k-{NN} {O}bjects in {R}oad {N}etworks},
	booktitle = {SSDBM},
	year = {2008},
	pages = {168-186},
	author = {Qin, Lu and Yu, Jeffrey Xu and Bolin Ding and Yoshiharu Ishikawa}
}
