Kečkić Dragoljub J. “Orthogonality and Smooth Points in \( C(K) \) and \( C_b(\Omega) \)”. Eurasian Mathematical Journal 3, no. 4 (December 30, 2012): 44–52. Accessed December 20, 2025. https://emj.enu.kz/index.php/main/article/view/806.