@ARTICLE{RS98,
  AUTHOR = {P. Y. A. Ryan and S. A. Schneider},
  JOURNAL = {Information Processing Letters},
  NUMBER = {1},
  PAGES = {7-10},
  TITLE = {An Attack on a Recursive Authentication Protocol: {A}
                   Cautionary Tale},
  VOLUME = {65},
  YEAR = {1998}
}

@TECHREPORT{bull97,
  AUTHOR = {J. Bull and D. J. Otway},
  INSTITUTION = {Defence Research Agency},
  NUMBER = {DRA/CIS3/PROJ/CORBA/SC/1/CSM/436-04/03},
  TITLE = {The Authentication Protocol},
  YEAR = {1997}
}