Peter A. Tucker David Maier Tim Sheard Paul Stephens Using Punctuation Schemes to Characterize Strategies for Querying over Data Streams. 1227-1240 2007 19 IEEE Trans. Knowl. Data Eng. 9 http://doi.ieeecomputersociety.org/10.1109/TKDE.2007.1052 db/journals/tkde/tkde19.html#TuckerMSS07