Li, Yuan, and Jieyi Zhao. “The Use of German Prepositions by Chinese German Learners in the Context of Conceptual Metaphor Theory - a Case Study of Um and in in Comparison With Native German Speakers and German Learners of Other First Languages”. Revista De Lenguas Para Fines Específicos, vol. 30, June 2024, pp. 62-83, https://ojsspdc.ulpgc.es/ojs/index.php/LFE/article/view/1650.