Survey of Electronic Payment Methods and Systems. - Paul J. M. Havinga; Gerard J. M. Smit; Arne Helme (EUROMEDIA, 1996)

Security Functions for a File Repository. - Arne Helme; Tage Stabell-Kulø (ACM SIGOPS Oper. Syst. Rev., 1997)

Detecting Key-Dependencies. - Tage Stabell-Kulø; Arne Helme; Gianluca Dini (ACISP, 1998)

Battery-powered distributed systems (extended abstract). - Paul J. M. Havinga; Arne Helme; Sape J. Mullender; Gerard J. M. Smit; Jaap Smit (ACM SIGOPS European Workshop, 1998)

Offline Delegation. - Arne Helme; Tage Stabell-Kulø (USENIX Security Symposium, 1999)