Sánchez Morillas CM, Valero Fernández P. The use of proper and improper interjections by students of Spanish as a foreign language: frequencies of use and values reflected in the CAES corpus. Didáctica [Internet]. 2022 Apr. 1 [cited 2026 Jul. 10];34:137-45. Available from: https://revistas.ucm.es/index.php/DIDA/article/view/81360