I. S. Pandiova. "THE DEVELOPMENT OF VOCAL PERFORMANCE AND VOCAL PEDAGOGY IN THE CONTEXT OF NON-ARTIFICIAL MUSIC OF THE 20TH–21ST CENTURIES IN SLOVAKIA." 4th International Multidisciplinary Scientific Conference on Social Sciences and Arts SGEM 2017 (2017): 67-72. https://doi.org/10.5593/sgemsocial2017/62/S22.008