Schryen, Guido. “Armed for the Spam Battle - a Technological and Organizational Infrastructure Framework.” In 40th Annual Hawaii International Conference on System Sciences, 2007.

Schryen, Guido. “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) 3, no. 2 (2007): 66–90.

Schryen, Guido. “Location Based Services.” In Vom LAN Zum Kommunikationsnetz - Systeme Und Applikationen, edited by Heinz Schulte. Kissing: Interest-Verlag, 2007.

Schryen, Guido. “Spam-Emails.” In Vom LAN Zum Kommunikationsnetz - Systeme Und Applikationen, Edition 02/2007, edited by Heinz Schulte, Vol. 9/12. Kissing: Interest-Verlag, 2007.

Schryen, Guido. “The Impact That Placing Email Addresses on the Internet Has on the Receipt of Spamf? An Empirical Analysis.” Computers &; Security 2, no. 5 (2007): 361–72.

Schryen, Guido. “A Formal Approach towards Assessing the Effectiveness of Anti-Spam Procedures.” In 39th Annual Hawaii International Conference on System Sciences, 2006.

Schryen, Guido. “A Honeypot for the Exploration of Spammers’ Behaviour.” IATAC IAnewsletter 8, no. 3 (2005): 22–25.

Schryen, Guido. “An E-Mail Honeypot Addressing Spammers’ Behavior in Collecting and Applying Addresses.” In Proceedings of the 6th IEEE Information Assurance Workshop, 37–41. Westpoint, 2005.

Schryen, Guido. “Security Aspects of Internet Voting.” In 37th Annual Hawaii International Conference on System Sciences, 2004.

Schryen, Guido. “Effektivität von Lösungsansätzen Zur Bekämpfung von Spam.” Wirtschaftsinformatik 46, no. 4 (2004): 281–88.

Schryen, Guido. “Fighting Spam: Motivating an Account-Based Approach.” In Proceedings of the IADIS International Conference WWW/Internet 2004. Vol. 2, edited by Pedro Isaias, 937–40. Madrid: IADIS Press, 2004.

Schryen, Guido. “How Security Problems Can Compromise Remote Internet Voting Systems.” In Workshop of the ESF TED Programme, 121–31, 2004.

Schryen, Guido. “Neulich Am Hotspot - Bringt Mobiles Internet Die Menschen Ins Netz?” In Digitale Teilung - Digitale Integrationf: Perspektiven Der Internetnutzung, edited by Gernot Gehrke, 45–51. München: KOPAED-Verlag, 2004.

Schryen, Guido, Jan Herstell, and Markus Schoenen. Online Marktforschung Im Mittelstand: Analyse von Konsumentenverhalten in 3D-Internet-Welten. Wiesbaden: Deutscher Universitäts-Verlag, 2003.

Schryen, Guido, and Jan Herstell. “Online-Marktforschung - Analyse von Konsumentenverhalten in Virtuellen Umgebungen, in: Information Management &; Consulting, 18,2.” IMf: Die Zeitschrift Für Information Management Und Consulting 18, no. 2 (2003): 74–77.

Schryen, Guido. “E-Democracy: Internet Voting.” In Proceedings of the IADIS International Conference WWW Internet 2003. Vol. 2, 1017–21. Algarve: IADIS Press, 2003.

Schryen, Guido. “Internet-Wahlen.” In 6. Internationale Tagung Wirtschaftsinformatik, 937–56, 2003.

Schryen, Guido, and Markus Schoenen. “Data Warehouse in Der Marktforschung - Analyse von Benutzeraktivitäten in Virtuellen Welten.” In Data Warehousing 2002, 103–19, 2002.

Schryen, Guido, and Jürgen Karla. “Elektronisches Papier - Display-Technologie Mit Weitem Anwendungsspektrum.” Wirtschaftsinformatik 44, no. 6 (2002): 567–74.

Schryen, Guido. “Elektronische Zeitung - Das Erbe Gutenbergs?” I-Com. Zeitschrift Für Interaktive Und Kooperative Medien, no. 3 (2002): 36–37.