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 Object Persistence February 19, 2014 by Roberto Zicari · Published February 19, 2014 · Last modified March 2, 2014