Heinemann, Friedrich, Marcel Olbert, Olena Pfeiffer, Thomas Schwab, Christoph Spengel and Kathrin Stutzenberger (2018), Implications of the US Tax Reform for Transatlantic FDI, Intereconomics 53 , 87-93.

Nicolay, Katharina, Hannah Nusser and Olena Pfeiffer (2017), On the Interdependency of Profit Shifting Channels and the Effectiveness of Anti-Avoidance Legislation, ZEW Discussion Paper No. 17-066, Mannheim

Pfeiffer, Olena and Christoph Spengel (2017), Tax Incentives for Research and Development and Their Use in Tax Planning, ZEW Discussion Paper No. 17-046, Mannheim

Spengel, Christoph, Christian Rammer, Katharina Nicolay, Olena Pfeiffer, Ann-Catherin Werner, Marcel Olbert, Florence Blandinières, Martin Hud and Bettina Peters (2017), Steuerliche FuE-Förderung, Studien zum deutschen Innovationssystem , Berlin.

Pfeiffer, Olena and Johannes Voget (2016), Corporate Taxation and Location of Intangible Assets: Patents vs. Trademarks, ZEW Discussion Paper No. 16-015, Mannheim

Pfeiffer, Olena, Christoph Spengel and Johannes Voget (2015), The Impact of Taxes on Bilateral Royalty Flows, ZEW Discussion Paper No. 15-052, Mannheim

Spengel, Christoph, Frank Schmidt, Jost Henrich Heckemeyer, Katharina Nicolay, Alexandra Bartholmeß, Rainer Bräutigam, Julia Braun, Peter Buchmann, Theresa Bührle, Elisa Casi, Verena Dutt, Leonie Fischer, Christoph Harendt, Marcel Olbert, Olena Pfeiffer, Thomas Schwab, Daniela Steinbrenner, Kathrin Stutzenberger, Maximilian Todtenhaupt, Heiko Vay and Ann-Catherin Werner (2018), Effective Tax Levels Using the Devereux/Griffith Methodology - Update 2017, Project for the EU Commission TAXUD/2013/CC/120 Final Report 2017, Mannheim

Heinemann, Friedrich, Olena Pfeiffer, Thomas Schwab, Christoph Spengel, Marcel Olbert and Kathrin Stutzenberger (2017), Analysis of US Corporate Tax Reform Proposals and their Effects for Europe and Germany, Mannheim

Spengel, Christoph, Frank Schmidt, Jost Henrich Heckemeyer, Katharina Nicolay, Alexandra Bartholmeß, Rainer Bräutigam, Julia Braun, Verena Dutt, Maria Theresia Evers, Christoph Harendt, Oliver Klar, Hannah Nusser, Marcel Olbert, Olena Pfeiffer, Daniela Steinbrenner, Frank Streif and Maximilian Todtenhaupt (2017), Effective Tax Levels Using the Devereux/Griffith Methodology: Final Report 2016, Project for the EU Commission TAXUD/2013/CC/120 Final Report 2016, Mannheim

Pfeiffer, Olena, Christoph Ernst, Georg Geberth, Chin Chin King, Christiane Malke, Steffen Spangenberg, Christoph Spengel, Cedric von der Hellen, Berthold Welling, Ann-Catherin Werner and Monika Wünnemann (2016), 360-Grad-Check, Steuerliche Rahmenbedingungen für Forschung & Entwicklung, Mannheim

Spengel, Christoph, Dieter Endres, Katharina Nicolay, Jost Henrich Heckemeyer, Alexandra Bartholmeß, Rainer Bräutigam, Julia Braun, Olena Pfeiffer, Maria Theresia Evers, Christoph Harendt, Frank Streif, Maximilian Todtenhaupt and Manuel Halter (2016), Effective Tax Levels using the Devereux/Griffith Methodology - Update 2015, Project for the EU Commission TAXUD/2013/CC/120 Intermediate Report 2015, 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

06. – 08.2017 Oxford University Centre for Business Taxation, United Kingdom