Mihajlovic, L. 1974: Contribution to the Study of Diffusion of the Species Hemianax ephippiger (Burmeister) in Europe (Odonata: Aeschnidae). - Beiträge Zur Entomologie = Contributions to Entomology 24(1-4): 105–106 - doi: 10.21248/contrib.entomol.24.1-4.105-106