Calculating Costs for Quality of Security Service. - E. Spyropoulou; Timothy E. Levin; Cynthia E. Irvine (ACSAC, 2000)

Security as a Dimension of Quality of Service in Active Service Environments. - Cynthia E. Irvine; Timothy E. Levin; E. Spyropoulou; Bruce Allen (Active Middleware Services, 2001)