Elijio, Aistė, and Dovilė Malijonytė. “Symmetry As Tactics of Solving Mathematical Problems”. Lietuvos matematikos rinkinys 53, no. B (December 20, 2012): 157–162. Accessed October 28, 2025. https://test.zurnalai.vu.lt/LMR/article/view/17118.