Introduction to Object Oriented Databases by Roberto Zicari · Published January 1, 2000 · Updated February 16, 2014 Liam Quin Introduces to the basic concepts of object oriented databases. LINK (DOC)
The Definite Guide to db4o June 1, 2006 by Roberto Zicari · Published June 1, 2006 · Last modified January 3, 2015
Object Database vs. Object-Relational Databases January 1, 1997 by Roberto Zicari · Published January 1, 1997 · Last modified January 3, 2015
Object Oriented Database Management Systems January 1, 2001 by Roberto Zicari · Published January 1, 2001 · Last modified February 16, 2014