DAGIENĖ, Valentina. Problems on the teaching of geometry in comprehensive schools for 21st century. Lietuvos matematikos rinkinys, [S. l.], v. 41, n. spec., p. 351–355, 2001. DOI: 10.15388/LMR.2001.34570. Disponível em: https://journals.vu.lt./LMR/article/view/34570. Acesso em: 19 apr. 2025.