Bertschek, Irene, Daniel Cerquera und Gordon Jochem Klein (2013), More Bits - More Bucks? Measuring the Impact of Broadband Internet on Firm Performance, Information Economics and Policy Vol. 25, Issue 3, 190-203.

Klein, Gordon Jochem und Justus Haucap (2012), How regulation affects network and service quality in related markets, Economics Letters 117, Issue 2, 521-524.

Klein, Gordon Jochem (2011), Essays in Competition and Innovation - An Empirical and Theoretical Analysis, Dissertation, Universität Düsseldorf.

Cerquera, Daniel und Gordon Jochem Klein (2013), Intermediate Input Markets, ICT and Innovation in Germany: A Firm Level Analysis, ZEW Discussion Paper No. 13-013, Mannheim

Bertschek, Irene, Daniel Cerquera und Gordon Jochem Klein (2011), More Bits – More Bucks? Measuring the Impact of Broadband Internet on Firm Performance, ZEW Discussion Paper No. 11-032, Mannheim

Klein, Gordon Jochem (2010), Cartel Destabilization and Leniency Programs – Empirical Evidence, ZEW Discussion Paper No. 10-107, Mannheim

Cerquera, Daniel und Gordon Jochem Klein (2008), Endogenous Firm Heterogeneity, ICT and R&D Incentives, ZEW Discussion Paper No. 08-126, Mannheim

Vanberg, Margit und Gordon Jochem Klein (2008), Regulatory Practice in the European Telecommunications Sector Normative Justification and Practical Application, ZEW-Dokumentation Nr. 08-02, Mannheim

Bertschek, Irene, Daniel Cerquera und Gordon Jochem Klein (2010), Die Bedeutung des Breitbandinternets für den Unternehmenserfolg, Deutsche Telekom AG, Mannheim