R.  Caldara, ?Description of four new species of Gymnetron from South Africa (Coleoptera Curculionidae)?, Bollettino della Societa Entomologica Italiana, vol. 143, pp. 33-39, 2011.

R.  Caldara, ?Revision of Palaearctic species of the genus Gymnetron (Insecta, Coleoptera: Curculionidae).?, Aldrovandia, vol. 4, pp. 27-103, 2008.

P. A.  Angelov, ?[Coleoptera, Curculionidae. Part 4. Calandrinae. 2.]?, Fauna na Bulgariya, pp. 1-301, 1980.