Hyun J. Moon Carlo Curino MyungWon Ham Carlo Zaniolo PRIMA: archiving and querying historical data with evolving schemas. 1019-1022 2009 SIGMOD Conference http://doi.acm.org/10.1145/1559845.1559970 conf/sigmod/2009 db/conf/sigmod/sigmod2009.html#MoonCHZ09