@article{PTZM2002,
AUTHOR = "Dimitris Papadias and Yufei Tao and Jun Zhang and Nikos Mamoulis and Qiongmao Shen and Jimeng Sun",
TITLE = "Indexing and Retrieval of Historical Aggregate Information about Moving Objects",
JOURNAL = "IEEE Data Engineering Bulletin ",
YEAR = "2003",
volume = "2",
number = "25",
pages = "10-17"
}