An information-theoretic approach to normal forms for relational and XML data.

Marcelo Arenas Leonid Libkin An information-theoretic approach to normal forms for relational and XML data. 246-283 2005 52 J. ACM 2 http://doi.acm.org/10.1145/1059513.1059519 db/journals/jacm/jacm52.html#ArenasL05