Sušinskas, Jurgis, and Juozas Juvencijus Mačys. “An Olympiadic System of Equations”. Lietuvos matematikos rinkinys 53, no. B (December 20, 2012): 237–242. Accessed November 5, 2025. https://www.zurnalai.vu.lt/LMR/article/view/17134.