Volkamer, Melanie, and Guido Schryen. “Measuring ETrust in Distributed Systems - General Concept and Application to Internet Voting.” In Proceedings of the 23rd Bled EConference, 2010.

Schryen, Guido, and Rich Eliot. “Increasing Software Security through Open Source or Closed Source Development? Empirics Suggest That We Have Asked the Wrong Question.” In 43rd Annual Hawaii International Conference on System Sciences, 2010.

Schryen, Guido, and Christian Bodenstein. “A Decision-Theoretic Foundation of IS Business Value Research.” In Proceedings of the 18th European Conference on Information Systems (ECIS 2010), 2010.

Schryen, Guido. “A Fuzzy Model for IT Security Investments.” In Sicherheit 2010f: Sicherheit, Schutz Und Zuverl\'22assigkeitf; Konferenzband Der 5. Jahrestagung Des Fachbereichs Sicherheit Der Gesellschaft F\'22ur Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin, edited by Felix C. Freiling, 170:289–304. GI-Edition: Lecture Notes in Informatics. Proceedings. Bonn: Gesellschaft für Informatik, 2010.

Schryen, Guido. “An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness.” In Proceedings of the First Scandinavian Conference on Information Systems (SCIS), 2010.

Schryen, Guido. “Preserving Knowledge on IS Business Value: What Literature Reviews Have Done.” Business \'26; Information Systems Engineering (BISE) 52, no. 4 (2010): 225–37.

Schryen, Guido. “Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews Zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done).” Wirtschaftsinformatik 52, no. 4 (2010): 225–37.

Volkamer, Melanie, Guido Schryen, Lucie Langer, Axel Schmidt, and Johannes Buchmann. “Elektronische Wahlen: Verifizierung vs. Zertifizierung.” In Workshop Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung, 2009.

Schryen, Guido, and Eliot Rich. “Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland.” IEEE Transactions on Information Forensics \'26; Security 4, no. 4 Part (2009): 729–44.

Schryen, Guido, and Rouven Kadura. “Open Source vs. Closed Source Software: Towards Measuring Security.” In 24th Annual ACM Symposium on Applied Computing, 2009.

Schryen, Guido. “A Comprehensive and Comparative Analysis of the Patching Behavior of Open Source and Closed Source Software Vendors.” In 5th International Conference on IT Security Incident Management \'26; IT Forensics, 2009.

Schryen, Guido. “Security of Open Source and Closed Source Software: An Empirical Comparison of Published Vulnerabilities.” In 15th Americas Conference on Information Systems, 2009.

Schryen, Guido. “Effektivität Und Effizienz von Anti-Spam-Maßnahmen.” Linux Technical Review, no. 7 (2008).

Schryen, Guido. “Practical Security of Large-Scale Elections: An Exploratory Case Study of Internet Voting in Estonia.” In 7th Workshop on E-Business (WEB 2008, AIS Special Interest Group on E-Business), 2008.

Schryen, Guido. Preventing E-Mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework, 2007.

Schryen, Guido. “A Scalable and Flexible Infrastructure Framework For Addressing Spam.” In Proceedings of IPSI International Conference on Advances in the Internet, Processing, Systems, and Interdisciplinary Research, edited by D. Satesh and R. Prabhakar, 55–64. Hyderabad, India: ICFAI University Press, 2007.

Schryen, Guido. Anti-Spam Measures: Analysis and Design. Berlin, Heidelberg, New York: Springer, 2007.

Schryen, Guido. “Anti-Spam Legislation: An Analysis of Laws and Their Effectiveness.” Information and Communications Technology Law 16, no. 1 (2007): 17–32.

Schryen, Guido. “Approaches Addressing Spam.” In Spam: An Introduction, edited by D. Satesh and R. Prabhakar, 41–57. Hyderabad, India: ICFAI University Press, 2007.

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