V. Brezin, B. Zhelyazova, R. Milchev, M. Mladenova, and E. Tsvetkova, “AN INNOVATIVE APPROACH IN EDUCATION”, INNO, vol. 2, no. 1, May 2013, Accessed: Apr. 14, 2026. [Online]. Available: http://innojs.ltu.bg/index.php/scjournal-inno/article/view/37