Introduction to Object-Oriented Databases by Roberto Zicari · Published September 1, 1998 · Updated February 16, 2014 Steve Hand and Jane Chandler Very visual introduction to ODBMS. DOWNLOAD (PDF)
Unified Database Theory November 1, 2010 by Roberto Zicari · Published November 1, 2010 · Last modified February 16, 2014
Evaluating NoSQL for Enterprise Applications January 1, 2012 by Roberto Zicari · Published January 1, 2012 · Last modified February 16, 2014
ODE Object Database January 1, 1996 by Roberto Zicari · Published January 1, 1996 · Last modified May 9, 2014