Yurieva Shekerliyska-Vachkova, Hristina. “CONDITIONS AND OPPORTUNITIES FOR INTEGRATION OF ELEMENTS OF CONSTRUCTIVIST APPROACH IN THE BULGARIAN MATHEMATICS CURRICULUM”. KNOWLEDGE - International Journal , vol. 70, no. 3, June 2025, pp. 283-9, http://ojs.ikm.mk/index.php/kij/article/view/7572.