D. Anjos-Santos, C. Carriço, J. M. Costa, and T. C. Santos, “Description of the final instar larvae of Acanthagrion gracile (Rambur) and Acanthagrion lancea Selys (Odonata: Coenagrionidae)”, Zootaxa, vol. 2832, no. 1, pp. 44–50, Apr. 2011.