OODBMS Schema Refactoring Catalogue by Roberto Zicari · Published December 1, 2005 · Updated February 18, 2014 Stefan Edlich Object database schema refactoring catalogue project LINK
The Definite Guide to db4o June 1, 2006 by Roberto Zicari · Published June 1, 2006 · Last modified January 3, 2015
Simple Object Persistence with the db4o Object Database December 1, 2004 by Roberto Zicari · Published December 1, 2004 · Last modified February 18, 2014
029.01 Hitting the Relational Wall January 1, 2005 by Roberto Zicari · Published January 1, 2005 · Last modified February 16, 2014