Marios Hadjieleftheriou George Kollios Vassilis J. Tsotras Dimitrios Gunopulos Indexing spatiotemporal archives. 143-164 2006 15 VLDB J. 2 http://dx.doi.org/10.1007/s00778-004-0151-3 db/journals/vldb/vldb15.html#HadjieleftheriouKTG06