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Bürgel, Christoph, Corinna Koch, Claudia  Schlaak, and Judith  Visser, eds. ðd8	Zeitschrift für Romanische Sprachen und ihre Didaktik. Heft 15,1. Stuttgart: ibidem, 2021.
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Tolksdorf, Nils Frederik, Franziska E. Viertel, and Katharina J. Rohlfing. “Do Shy Preschoolers Interact Differently When Learning Language With a Social Robot? An Analysis of Interactional Behavior and Word Learning.”https://doi.org/10.3389/frobt.2021.676123__Frontiers in Robotics and AI, 2021.https://doi.org/10.3389/frobt.2021.676123 .
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Heidgen, Michael. “Wurzel.” In Metzler Lexikon Literarischer Symbole, 2021.
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Uppenkamp, Vera, Anna Neumann, and Katharina Kammeyer. “This is my Fight Song.” In Musik als Lebensmittel. Kulturwissenschaftlich-theologische Rationen für ein Jahr, edited by Marion Keuchen and Richard Janus, 8:139–47. INPUT - Interdisziplinäre Paderborner Untersuchungen zur Theologie. Münster: LIT, 2021.
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