In Chapter in book http://www.elsevier.com/wps/find/bookdescription.cws_home/706816/description based on ON HIGH PERFORMANCE COMPUTING TECHNOLOGY AND APPLICATIONS Cetraro Italy May 31-June 3 2004. "Grid Computing: A New Frontier of High Performance Computing" (ed. L. Grandinetti, Elsevier, Amsterdam, 2005 ) pages 305-331 (2005), pp. 305-331.