Transitivity Based Enrollment Strategy for Signature Verification. - Claus Vielhauer; Ralf Steinmetz; Astrid Mayerhöfer (ICDAR, 2001)

Biometric Hash based on Statistical Features of Online Signatures. - Claus Vielhauer; Ralf Steinmetz; Astrid Mayerhöfer (ICPR (1), 2002)

Biometric authentication for ID cards with hologram watermarks. - Lucilla Croce Ferri; Astrid Mayerhöfer; Marcus Frank; Claus Vielhauer; Ralf Steinmetz (Security and Watermarking of Multimedia Contents, 2002)