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. https://doi.org/10.21248/contrib.entomol.24.1-4.105-106