On the Expressive Power of Data Integration Systems Andrea Calì, Diego Calvanese, Giuseppe De Giacomo, and Maurizio Lenzerini   View Paper (PDF)   Return to Session 8: System and Data Integration BIBTEX @inproceedings       {DBLP:conf/er/CaliCGL02,   author    = {Andrea Calì and                 Diego Calvanese and                 Giuseppe De Giacomo and                 Maurizio Lenzerini},    booktitle = {ER},    title     = {On the Expressive Power of Data Integration Systems.},    pages     = {338-350},    year      = {2002},    url       = {db/conf/er/er2002.html#CaliCGL02},    ee        = {http://link.springer.de/link/service/series/0558/bibs/2503/25030338.htm},    crossref  = {conf/er/2002},    bibsource = {DBLP, http://dblp.uni-trier.de}  } ©2004 Association for Computing Machinery