Approaches to Adding Persistence to Java by Roberto Zicari · Published January 1, 1996 · Updated February 19, 2014 Eliot Moss, Antony Hosking LINK (PDF)
Persistenz von Objekten September 1, 2004 by Roberto Zicari · Published September 1, 2004 · Last modified February 18, 2014
Impedance Mismatch is not an “Objects vs. Relations” Problem.(DRAFT) August 1, 2012 by Roberto Zicari · Published August 1, 2012 · Last modified February 16, 2014