VUGDALIĆ, Ramiz; HALILOVIĆ, Sanela. SOME COSINE OPERATOR FUNCTIONS IN R^3. Matematichki Bilten, [S. l.], v. 48, n. 2, p. 113–142, 2025. DOI: 10.37560/matbil24482113v. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1963. Acesso em: 13 jun. 2026.