Kopyściańska, Katarzyna. “Controversies Around the so-Called ‘Sealing’ the Tax System in the Context of Recent Changes Relating to the Tax on Goods and Services”. Tax Law Quarterly, no. 3 (September 30, 2017): 39–54. Accessed May 20, 2024. https://czasopisma.uni.lodz.pl/tax/article/view/5215.