“Taxonomic significance of apical system in the Clypeaster echinoids: Taksonomski značaj apikalnog sistema kod roda Clzpeaster (Echinoidea)” (1995) Geološki anali Balkanskoga poluostrva, 59(1), pp. 131–147. Available at: https://gabp.rgf.bg.ac.rs/index.php/gabp/article/view/509 (Accessed: 6 November 2026).