Trubina, Irena, and Maruta Sile. “Development of Adolescent Individual Attention Focus Abilities During Vocal Ensemble Sessions”. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 2 (May 17, 2015): 445–452. Accessed November 24, 2024. https://journals.ru.lv/index.php/SIE/article/view/421.