Elisa Bertino Dolores Cuadra Paloma Martínez An Object-Relational Approach to the Representation of Multi-granular Spatio-Temporal Data. 119-134 2005 conf/caise/2005 CAiSE http://dx.doi.org/10.1007/11431855_10 db/conf/caise/caise2005.html#BertinoCM05