APYNIS, Antanas. On teaching fundamentals of calculus at secondary school. Lietuvos matematikos rinkinys, [S. l.], v. 51, n. proc. LMS, p. 80–84, 2010. DOI: 10.15388/LMR.2010.15. Disponível em: https://www.journals.vu.lt/LMR/article/view/17779.. Acesso em: 17 aug. 2024.