Fery 1999. Revision of a part of the memnonius-group of Hydroporus Clairville, 1806 (Insecta: Coleoptera: Dytiscidae) with the description of nine new taxa, and notes on other species of the genus. Annalen des Naturhistorischen Museums in Wien Serie B Botanik und Zoologie, 101B, Dezember 1999: 217-269