Enhancing the Security of Internet Applications using location: A New Model for Tamper-resistant GSM Location. - Chris Wullems; Mark Looi; Andrew J. Clark (ISCC, 2003)

A Broadcast Authentication and Integrity Augmentation for Trusted Differential GPS in Marine Navigation. - Chris Wullems; Harikrishna Vasanta; Mark Looi; Andrew J. Clark (Cryptographic Algorithms and their Uses, 2004)

Towards Context-aware Security: An Authorization Architecture for Intranet Environments. - Chris Wullems; Mark Looi; Andrew J. Clark (PerCom Workshops, 2004)