W. E.  Clark, ?Curculio picirostris Fabricius, 1787, and Tychius stephensi Schönherr, 1836 (Coleoptera: Curculionidae): proposed conservation under the plenary powers. Z.N.(S.)2266.?, Bulletin of Zoological Nomenclature, vol. 41, pp. 45-52, 1984.