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- Szwedo J., Stroinski A. Ptychogroehnia reducta gen. and sp. nov. of the fossil tribe Ptychoptilini from the Eocene Baltic amber (hemiptera: fulgoroidea: achilidae)
- Szwedo J. A new genus waghilde gen. Nov. Representing a new tribe of the planthopper family Achilidae from the Eocene Baltic amber (Hemiptera: Fulgoromorpha)