Ortmann R, Pummerer E. Distortional effects of separate accounting and formula apportionment on factor allocation. Journal of Business Economics. Published online 2023. doi:10.1007/s11573-022-01133-5

Ortmann R, Schindler D. Income Shifting and Management Incentives.; 2022.

Warkulat S, Krull S, Ortmann R, Klocke N, Pelster M. COVID-19 reporting and willingness to pay for leisure activities. Covid Economics. 2021;(83):183-205.

Ortmann R, Warkulat S, Krull S, Klocke N, Pelster M. COVID-19 Reporting and Willingness to Pay for Leisure Activities. Vol 83.; 2021.

Ortmann R, Simons D, Voeller D. Real Effects of an International Tax Reform for MNEs. Vol 64.; 2021.

Ortmann R, Pelster M, Wengerek ST. COVID-19 and investor behavior. Finance Research Letters. 2020;37. doi:10.1016/j.frl.2020.101717

Ortmann R, Pelster M, Wengerek ST. COVID-19 and investor behavior. Finance Research Letters. 2020;37. doi:10.1016/j.frl.2020.101717

Ortmann R, Sureth-Sloane C. Can the CCCTB Alleviate Tax Discrimination against Loss-Making European Multinational Groups? Journal of Business Economics. 2016;86(5):441-475. doi:10.1007/s11573-015-0780-6

Ortmann R, Sureth-Sloane C. Can the CCCTB Alleviate Tax Discrimination against Loss-Making European Multinational Groups? Journal of Business Economics. 2016;86(5):441-475. doi:10.1007/s1007-015-0780-6

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

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

Ortmann R. Uncertainty in Weighting Formulary Apportionment Factors. Die Betriebswirtschaft. 2015;75(3):161-177.

Ortmann R, Sureth-Sloane C. Can the CCCTB Alleviate Tax Discrimination against Loss-Making European Multinational Groups? Vol 165.; 2014.