Reference

Günther Fleck, André Nel, Günther Bechly, Xavier Delclòs, Edmund A. Jarzembowski, Robert A. Coram (2008): New Lower Cretaceous ‘libelluloid’ dragonflies (Insecta: Odonata: Cavilabiata) with notes about estimated divergence dates for this group – Palaeodiversity – 1: 19 - 36.