Hennies, Manfred, and Matti Raudjärv. “Krüptorahad. Sissejuhatavaid Mõtteid Hetkeolukorrast”. Estonian Discussions on Economic Policy 26, no. 1-2 (November 5, 2018). Accessed April 22, 2019. http://ojs.utlib.ee/index.php/TPEP/article/view/14504.