G. DEMENKO, A. WAGNER, and N. CYLWIK, “The Use of Speech Technology in Foreign Language Pronunciation Training”, Arch. Acoust., vol. 35, no. 3, pp. 309–329, Nov. 2013, Accessed: Apr. 28, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/227