DENOFAS: A Vulnerability Assessment Tool. - Rui Costa Cardoso; Mário M. Freire (ICWI, 2003)

Management of Security in TCP/IP Hosts Using Dedicated Monitoring Applications. - Rui Costa Cardoso; Mário M. Freire (Net-Con, 2003)

Intelligent Assessment of Distributed Security in TCP/IP Networks. - Rui Costa Cardoso; Mário M. Freire (HSNMC, 2004)

Towards Autonomic Minimization of Security Vulnerabilities Exploitation in Hybrid Network Environments. - Rui Costa Cardoso; Mário M. Freire (ICAS/ICNS, 2005)

SAPA: Software Agents for Prevention and Auditing of Security Faults in Networked Systems. - Rui Costa Cardoso; Mário M. Freire (ICOIN, 2005)

Towards a Trust Framework for Multi-User Virtual Environments. - Rui Costa Cardoso; Abel João Padrão Gomes (ICCSA (1), 2014)

A User Trust System for Online Games - Part I: An Activity Theory Approach for Trust Representation. - Rui Costa Cardoso; Abel João Padrão Gomes; Mário M. Freire (IEEE Trans. Comput. Intell. AI Games, 2017)

A User Trust System for Online Games - Part II: A Subjective Logic Approach for Trust Inference. - Rui Costa Cardoso; Abel João Padrão Gomes; Mário M. Freire (IEEE Trans. Comput. Intell. AI Games, 2017)