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Nehalennia speciosa (Charpentier,1840) in Europe: a case of a vanishing relict (Zygoptera: Coenagrionidae)
Bernard, R., & H. Wildermuth (2005). Nehalennia speciosa (Charpentier,1840) in Europe: a case of a vanishing relict (Zygoptera: Coenagrionidae). Odonatologica 34: 335-378.