Waltereit, Richard, and Ulrich Detges. “Different Functions, Different Histories. Modal Particles and Discourse Markers from a Diachronic Point of View”. Catalan Journal of Linguistics 6, no. 1 (December 1, 2007): 61–80. Accessed April 29, 2025. https://revistes.uab.cat/catjl/article/view/v6-waltereit-detges.