Steven Dawson Sabrina De Capitani di Vimercati Patrick Lincoln Pierangela Samarati Maximizing Sharing of Protected Information. 496-541 2002 64 J. Comput. Syst. Sci. 3 http://dx.doi.org/10.1006/jcss.2001.1807 db/journals/jcss/jcss64.html#DawsonVLS02