Object Oriented Database Management Systems by Roberto Zicari · Published January 1, 2001 · Updated February 16, 2014 Dare Obasanjo This paper explores use cases for ODBMS and shows code examples. LINK
Prevalence: Transparent, Fault-Tolerant Object Persistence June 1, 2005 by Roberto Zicari · Published June 1, 2005 · Last modified February 18, 2014
The Definite Guide to db4o June 1, 2006 by Roberto Zicari · Published June 1, 2006 · Last modified January 3, 2015
Evaluating NoSQL for Enterprise Applications January 1, 2012 by Roberto Zicari · Published January 1, 2012 · Last modified February 16, 2014