A rule-based framework for role based delegation. - Longhua Zhang; Gail-Joon Ahn; Bei-tseng Chu (SACMAT, 2001)

A role-based delegation framework for healthcare information systems. - Longhua Zhang; Gail-Joon Ahn; Bei-tseng Chu (SACMAT, 2002)

Constrained Role-based Delegation. - Longhua Zhang; Gail-Joon Ahn (SEC, 2003)

Authorization management for role-based collaboration. - Gail-Joon Ahn; Longhua Zhang; Dongwan Shin; Bill Chu (SMC, 2003)

A rule-based framework for role-based delegation and revocation. - Longhua Zhang; Gail-Joon Ahn; Bei-tseng Chu (ACM Trans. Inf. Syst. Secur., 2003)

Role-Based Privilege Management Using Attribute Certificates and Delegation. - Gail-Joon Ahn; Dongwan Shin; Longhua Zhang (TrustBus, 2004)