Artenschutzprogramm für die Gekielte Smaragdlibelle (Oxygastra curtisii, Insecta, Odonata) in Deutschland : das Beispeiel der Population an der Our / Jürgen Ott [and others]
Species protection programme for the orange-spotted emerald (Oxygastra curtisii, Insecta, Odonata) in Germany : the example of the River Our population