Analysing, Profiling and Optimising Orthogonal Persistence for Java by Roberto Zicari · Published January 1, 1997 · Updated February 19, 2014 Quintin Cutts, Antony Hosking LINK (PDF)
Java and Databases May 1, 2004 by Roberto Zicari · Published May 1, 2004 · Last modified February 16, 2014
Object Persistence Design Guidelines January 1, 2005 by Roberto Zicari · Published January 1, 2005 · Last modified February 19, 2014