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

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, 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/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, and Erich Pummerer. Formula Apportionment or Separate Accounting? Tax-Induced Distortions of Multinationals’ Locational Investment Decisions. 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.