Hačatrjana, L. ., and I. . Linde. “Piloting Supplementary Materials Aimed at Developing Students’ Problem-Solving and Self-Regulated Learning Skills”. International Journal of Learning, Teaching and Educational Research, vol. 22, no. 6, June 2023, pp. 475-93, http://ijlter.myres.net/index.php/ijlter/article/view/1662.