MAP20071506203 Bunn, Matthew Thinking about how many guards will do the job / Matthew Bunn Introduction -- Factors that may lead to increased per-unit guard effectiveness -- Questions on the strength of the factors -- Conceptual problems with "effectiveness" against an unspecified threat -- Security: more than just numbers En: Risk analysis : an international journal. - New York and London. - nº 4, August 2004 ; p. 949-953 1. Estados Unidos . 2. Atentados . 3. Terrorismo . 4. Seguridad nuclear . 5. Personal de seguridad . 6. Planes de seguridad . I. Título. II. Título: Risk analysis : an international journal.