Leppik K, Tejedor-García C. Estoñol, a computer-assisted pronunciation training tool for Spanish L1 speakers to improve the pronunciation and perception of Estonian vowels. ESUKA-JEFUL [Internet]. 2019 Dec. 17 [cited 2024 Apr. 20];10(1):89-104. Available from: https://ojs.utlib.ee/index.php/jeful/article/view/jeful.2019.10.1.05