Künnapas, Kaido. “The Concept of Preventive Actions Securing the Enforcement of Tax Liability to Be Determined in the Future: Prosperity under the Principle of Prevention in Tax Law”. Juridica International 23 (November 29, 2015): 87-97. Accessed March 23, 2019. http://ojs.utlib.ee/index.php/juridica/article/view/JI.2015.23.10.