Apynis Antanas, Kašuba Romualdas, and Stankus Eugenijus. “Regional Mathematical Contests: Experience and Perspectives”. Lietuvos matematikos rinkinys 52, no. proc. LMS (December 15, 2011): 62–66. Accessed September 20, 2021. https://www.journals.vu.lt/LMR/article/view/15375.