Rodrigo Machado Alvaro Freitas Moreira Renata de Matos Galante Mirella Moura Moro A Query Language for a Versioned Object Oriented Database. 72-86 2006 conf/sbbd/2006 SBBD http://www.lbd.dcc.ufmg.br:8080/colecoes/sbbd/2006/006.pdf db/conf/sbbd/sbbd2006.html#MachadoMGM06