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DING H, HOFFMANN R, JOKISCH O. An Investigation of Tone Perception and Production in German Learners of Mandarin. Arch. Acoust. [Internet]. 2013 Oct. 25 [cited 2026 Jan. 17];36(3):509–518. Available from: https://acoustics.ippt.gov.pl/index.php/aa/article/view/161