Sičiūnienė, Viktorija, and Janina Dargytė. “Eighth Grade Mathematical Achievements: Qualitative and Quantitative Aspects”. Lietuvos matematikos rinkinys 54, no. B (December 20, 2013): 184–189. Accessed October 27, 2025. https://test.zurnalai.vu.lt/LMR/article/view/17191.