José Moreira Cristina Ribeiro Jean-Marc Saglio Michel Scholl A model of approximations for representing time-varying multidimensional data. 113-120 2008 ICDE Workshops http://dx.doi.org/10.1109/ICDEW.2008.4498302 conf/icde/2008w db/conf/icde/icdew2008.html#MoreiraRSS08