Monica Nesi Giuseppina Rucci Formalizing and Analyzing the Needham-Schroeder Symmetric-Key Protocol by Rewriting. 95-114 2005 135 Electr. Notes Theor. Comput. Sci. 1 http://dx.doi.org/10.1016/j.entcs.2005.06.002 db/journals/entcs/entcs135.html#NesiR05