"1984"^^ . "Zanden et al. (1984)" . . "Zanden et al. (1984)" . . . "Zanden (van der) G., 1984. Neue pal\u00E4arktische Taxa der Familie Megachilidae (Hymenoptera, Apoidea, Megachilidae). Reichenbachia, 22 : 175-191." . "1984"^^ .