Ernst, Christof, Katharina Richter and Nadine Riedel (2014), Corporate Taxation and the Quality of Research and Development, International Tax and Public Finance 21 (4), 694-719.

Endres, Dieter, Jost Henrich Heckemeyer, Christoph Spengel, Katharina Nicolay and Katharina Richter (2013), Trends der Unternehmensbesteuerung in Europa und weiteren Industriestaaten, Der Betrieb , 896-901.

Heckemeyer, Jost Henrich, Katharina Richter and Christoph Spengel (2014), Tax Planning of R&D Intensive Multinationals, ZEW Discussion Paper No. 14-114, Mannheim

Ernst, Christof, Katharina Richter and Nadine Riedel (2013), Corporate Taxation and the Quality of Research and Development, ZEW Discussion Paper No. 13-010, Mannheim

Spengel, Christoph, Dieter Endres, Katharina Nicolay, Jost Henrich Heckemeyer, Alexandra Bartholmeß, Rainer Bräutigam, Olena Pfeiffer, Lisa Evers, Maria Theresia Evers, Manuel Halter, Christoph Harendt, Katharina Richter, Frank Streif and Maximilian Todtenhaupt (2014), Effective Tax Levels Using the Devereux/Griffith Methodology, Project for the EU Commission TAXUD/2013/CC/120 Final Report 2014, EU-Kommission, Mannheim

Spengel, Christoph, Dieter Endres, Katharina Nicolay, Jost Henrich Heckemeyer, Alexandra Bartholmeß, Rainer Bräutigam, Olena Pfeiffer, Manuel Halter, Katharina Richter, Uwe Scheuering and Frank Streif (2013), Effective Tax Levels using the Devereux/Griffith Methodology, Project for the EU Commission TAXUD/2013/CC/120 Intermediate Report 2013, EU-Kommission, Mannheim

Spengel, Christoph, Christina Elschner, Dieter Endres, Katharina Richter, Manuel Halter, Alexandra Bartholmeß, Daniel Dreßler, Katharina Nicolay and Jost Henrich Heckemeyer (2012), Effective Tax Levels at the Industry Level using the Devereux/Griffith Methodology, On-Demand Economic Analysis within the Framework Contract TAXUD/2008/CC/099, Mannheim

Spengel, Christoph, Christina Elschner, Dieter Endres, Alexandra Bartholmeß, Daniel Dreßler, Lisa Evers, Maria Theresia Evers, Katharina Nicolay, Jost Henrich Heckemeyer, Katharina Richter and Uwe Scheuering (2012), Effective Tax Levels using the Devereux/Griffith Methodology, Project for the EU Commission TAXUD/2008/CC/099 Final Report 2012, Mannheim

2013: Unternehmensbesteuerung und FuE-Qualität, 69th IIPF Conference, Taormina, Sicily, Italy