Leppik, K., & Tejedor-García, C. (2019). Estoñol, a computer-assisted pronunciation training tool for Spanish L1 speakers to improve the pronunciation and perception of Estonian vowels. Eesti Ja Soome-Ugri Keeleteaduse Ajakiri. Journal of Estonian and Finno-Ugric Linguistics, 10(1), 89–104. https://doi.org/10.12697/jeful.2019.10.1.05