G. Schryen, “Do anti-spam measures effectively cover the e-mail communication network? A formal approach,” The Journal of Information Systems Security (AIS Special Interest Group in Security), vol. 3, no. 2, pp. 66–90, 2007.

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

G. Schryen, “Effektivität von Lösungsansätzen zur Bekämpfung von Spam,” Wirtschaftsinformatik, vol. 46, no. 4, pp. 281–288, 2004.

G. Schryen, “Fighting Spam: Motivating an Account-based Approach,” in Proceedings of the IADIS International Conference WWW/Internet 2004. vol. 2, 2004, pp. 937–940.

M. Dücker, W. Müller, and J. Rubart, “Innovative Concepts for Configurating Shared Workspaces through Visual Programming,”10.1109/HICSS.1999.773046__presented at the Proceedings of the 32nd Annual Hawaii International Conference on Systems Sciences. 1999. HICSS-32, Maui, HI, USA , 1999, doi:10.1109/HICSS.1999.773046 .

M. Dücker, W. Müller, and J. Rubart, “VIPspace - A Visually Programmable Shared Workspace,”10.1109/VL.1998.706150__presented at the 1998 IEEE Symposium on Visual Languages , Halifax, NS, Canada , 1998, doi:10.1109/VL.1998.706150 .

W. Müller, G. Lehrenfeld, and C. Tahedl, “Complete Visual Specification and Animations of Protocols,”10.1109/ASPDAC.1995.486383__1995, doi:10.1109/ASPDAC.1995.486383 .