Funktionen und Architektur einer Internet-Lernumgebung für individuelles und kooperatives Lernen. - Otto K. Ferstl; Karsten Hahn; Klaus Schmitz; Christian Ullrich (D-CSCL, 2000)

Eine MultiView-Benutzungsoberfläche für integrierte Lernumgebungen. - Otto K. Ferstl; Christian Ullrich (DeLFI, 2004)

Entwicklung von Experimentierumgebungen für den Erwerb von Problemlösefähigkeit. - Christian Ullrich; Otto K. Ferstl (Wirtschaftsinformatik, 2005)

Foreign Exchange Trading with Support Vector Machines. - Christian Ullrich; Detlef Seese; Stephan K. Chalup (GfKl, 2006)

A real options approach for valuating intertemporal interdependencies within a value-based IT portfolio management - A risk-return perspective. - Dennis Diepold; Christian Ullrich; Alexander Wehrmann; Steffen Zimmermann (ECIS, 2009)

Forecasting and Hedging in the Foreign Exchange Markets - Christian Ullrich (2009)

Valuating Business Process Flexibility achieved through an Alternative Execution Path. - Kathrin Susanne Braunwarth; Christian Ullrich (ECIS, 2010)

Valuation of IT Investments Using Real Options Theory. - Christian Ullrich (Bus. Inf. Syst. Eng., 2013)

Bewertung von IT-Investitionen mit dem Realoptionsansatz. - Christian Ullrich (Wirtschaftsinf., 2013)

Estimation accuracy in Large is Programs - Insights from a Descriptive Case Study. - Marcus Kaiser; Christian Ullrich (ECIS, 2014)

Determining the Business Value of Volume Flexibility for Service Providers - a Real options Approach. - Carsten Klaus; Felix Krause 001; Christian Ullrich (ECIS, 2014)

A hybrid approach for simultaneous obstacle avoidance and stabilization of dynamic bipedal walking using the aldebaran nao robot. - Christian Ullrich; Sergiu Dotenco; Florian Gallwitz (I4CS, 2015)

Exploring the Benefits of Holographic Mixed Reality for Preoperative Planning with 3D Medical Images. - Marcus Mast; Ina Kaup; Sebastian Krüger; Christian Ullrich; Robert Schneider; Susanne Bay (MuC (Workshopband), 2019)