Lopes, Christian Sahb Batista, and Rafhael Frattari. “Tax Solidarity and Economic Groups”. Revista de Direito Tributário e Financeiro 1, no. 1 (December 7, 2015): 581–603. Accessed December 19, 2025. https://www.indexlaw.org/index.php/direitotributario/article/view/197.