Reference
Martin Räther (1989): Notes on four weevils in the tribe Cionini (Coleoptera: Curculionidae) associated with Scrophularia nodosa L. (Scrophulariaceae) - Part I: Biology and ecology of the weevils – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 40: 109 - 121.