SQL: A Spatio-Temporal Data Model and Query Language Cindy Xinmin Chen and Carlo Zaniolo   View Paper (PDF)   Return to Temporal and Active Database Modeling BIBTEX @inproceedings       {DBLP:conf/er/ChenZ00,   author    = {Cindy Xinmin Chen and                 Carlo Zaniolo},    booktitle = {ER},    title     = {SQL: A Spatio-Temporal Data Model and Query Language.},    pages     = {96-111},    year      = {2000},    url       = {db/conf/er/er2000.html#ChenZ00},    ee        = {http://link.springer.de/link/service/series/0558/bibs/1920/19200096.htm},    bibsource = {DBLP, http://dblp.uni-trier.de}  } ©2004 Association for Computing Machinery