Do anti-spam measures effectively cover the e-mail communication network? A formal approach
G. Schryen, The Journal of Information Systems Security (AIS Special Interest Group in Security) 3 (2007) 66–90.

An e-mail honeypot addressing spammers' behavior in collecting and applying addresses
G. Schryen, in: Proceedings of the 6th IEEE Information Assurance Workshop, Westpoint, 2005, pp. 37–41.

Effektivität von Lösungsansätzen zur Bekämpfung von Spam
G. Schryen, Wirtschaftsinformatik 46 (2004) 281–288.

Fighting Spam: Motivating an Account-based Approach
G. Schryen, in: P. Isaias (Ed.), Proceedings of the IADIS International Conference WWW/Internet 2004. Vol. 2, IADIS Press, Madrid, 2004, pp. 937–940.

Innovative Concepts for Configurating Shared Workspaces through Visual Programming
M. Dücker, W. Müller, J. Rubart, in:  Proceedings of the 32nd Annual Hawaii International Conference on Systems Sciences, Maui, HI, USA , 1999.

VIPspace - A Visually Programmable Shared Workspace
M. Dücker, W. Müller, J. Rubart, in:  Proceedings. 1998 IEEE Symposium on Visual Languages , Halifax, NS, Canada , 1998.

Complete Visual Specification and Animations of Protocols
W. Müller, G. Lehrenfeld, C. Tahedl, in: Proceedings of ASP-DAC’95/CHDL’95/VLSI’95 with EDA Technofair, Chiba, Japan , 1995.