Ortmann, Regina, and Erich Pummerer. “Distortional Effects of Separate Accounting and Formula Apportionment on Factor Allocation.”10.1007/s11573-022-01133-5__Journal of Business Economics, Springer Science and Business Media LLC, 2023, doi:10.1007/s11573-022-01133-5.

Ortmann, Regina, and Dirk Schindler. Income Shifting and Management Incentives. 2022.

Warkulat, Sonja, et al. “COVID-19 Reporting and Willingness to Pay for Leisure Activities.” Covid Economics, no. 83, CEPR Press, 2021, pp. 183–205.

Ortmann, Regina, et al. COVID-19 Reporting and Willingness to Pay for Leisure Activities. 2021.

Ortmann, Regina, et al. Real Effects of an International Tax Reform for MNEs. 2021.

Ortmann, Regina, et al. “COVID-19 and Investor Behavior.”10.1016/j.frl.2020.101717__Finance Research Letters, vol. 37, 101717, 2020, doi:10.1016/j.frl.2020.101717.

Ortmann, Regina, et al. “COVID-19 and Investor Behavior.”10.1016/j.frl.2020.101717__Finance Research Letters, vol. 37, 101717, Elsevier BV, 2020, doi:10.1016/j.frl.2020.101717.

Ortmann, Regina, and Caren Sureth-Sloane. “Can the CCCTB Alleviate Tax Discrimination against Loss-Making European Multinational Groups?”10.1007/s11573-015-0780-6__Journal of Business Economics, vol. 86, no. 5, 2016, pp. 441–75, doi:10.1007/s11573-015-0780-6.

Ortmann, Regina, and Caren Sureth-Sloane. “Can the CCCTB Alleviate Tax Discrimination against Loss-Making European Multinational Groups?”10.1007/s1007-015-0780-6__Journal of Business Economics, vol. 86, no. 5, 2016, pp. 441–75, doi:10.1007/s1007-015-0780-6.

Ortmann, Regina. Uncertainty in Weighting Formulary Apportionment Factors. How Does Weighting Uncertainty Impact After-Tax Income of Multinational Groups?,. Vol. 2015–10, 2015.

Ortmann, Regina. Uncertainty in Weighting Formulary Apportionment Factors and Its Impact on After-Tax Income of Multinational Groups. Vol. 198, 2015.

Ortmann, Regina. “Uncertainty in Weighting Formulary Apportionment Factors.” Die Betriebswirtschaft, vol. 75, no. 3, 2015, pp. 161–77.

Ortmann, Regina, and Caren Sureth-Sloane. Can the CCCTB Alleviate Tax Discrimination against Loss-Making European Multinational Groups? Vol. 165, 2014.