Sondore, Anita, Elfrīda Krastiņa, Pēteris Daugulis, and Elga Drelinga. “UNDERSTANDING OF BASIC CONCEPTS FOR MASTERING COMPETENCES OF SCHOOL MATHEMATICS”. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 2 (May 26, 2016): 330–342. Accessed March 11, 2026. https://archive-journals.rtu.lv/sie/article/view/1272.