Apynis , Antanas, and Juozas Šinkūnas. “Are the Basics of Calculus Necessary in Lithuanian Gymnasium?”.
Lietuvos matematikos rinkinys
47, no. spec. (June 14, 2021): 217–219. Accessed April 14, 2025.
https://www.journals.vu.lt/LMR/article/view/24200
.