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Leppik, K. and 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 (Dec. 2019), 89–104. DOI:https://doi.org/10.12697/jeful.2019.10.1.05.