ŠINKŪNAS , Juozas. Convex functions and inequalities in the secondary school. Lietuvos matematikos rinkinys, [S. l.], v. 48, n. proc. LMS, p. 142–148, 2008. DOI: 10.15388/LMR.2008.18081. Disponível em: https://www.journals.vu.lt/LMR/article/view/18081. Acesso em: 5 dec. 2025.