Bedjanič, M.; Pirnat, A.; Šalamun, A. A Contribution to the Knowledge of the Dragonfly Fauna of Broader Area Along Drava R. Between Ptuj and Središče Ob Dravi. Nat Slov 1999, 1 (1), 45-70. https://doi.org/10.14720/ns.1.1.45-70.