• Article 30 [Prohibition of New Customs Duties or Charges Having Equivalent Effect]Kerikmäe, Tanel; Särav, SandraTreaty on the Functioning of the European Union - A Commentary2021 / p. 711-718 https://doi.org/10.1007/978-3-030-43511-0_31
• Article 31 [Common Customs Tariff]Kerikmäe, Tanel; Särav, SandraTreaty on the Functioning of the European Union - A Commentary2021 https://eproofing.springer.com/books_v2/mainpage.php?token=odTi5FgswcHBIhji8RIrYBWaxAw9x_0CxK-8rEWmY5Y http://dx.doi.org/10.1007/978-3-030-43511-0