Commission to the European Parliament and the Council, Report on the application of Directive 2004/114/EC on the conditions of admission of third-country nationals for the purposes of studies, pupil exchange, unremunerated training or voluntary service (COM/2011/0587 final), no. 3.3 ([Internet, 2025-12-23](https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A52011DC0587))