van Weeghel S. Reflections on Separate Enterprise vs. Formulary Apportionment. In: Kukulski Z, Sęk M, eds. Challenges of Contemporary Tax Law: Jubilee Book Dedicated to Professor Włodzimierz Nykiel. Volume II. Lodz University Press; 2024:351-359. doi:10.18778/8331-399-3.28