Gorbunovs, Aleksandrs, Atis Kapenieks, and Ieva Kudina. “ADVANCEMENT OF E-PORTFOLIO SYSTEM TO IMPROVE COMPETENCE LEVELS”. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 1 (May 30, 2015): 61–72. Accessed March 11, 2026. https://archive-journals.rtu.lv/sie/article/view/975.