Busato, E. “Pre-Imaginal Stages of Cychrus Schmidti Chaudoir, 1837, and Cychrus semigranosus Palliardi, 1825, With a Key to the Larvae of the European Cychrus Species (Coleoptera: Carabidae)”. Zootaxa, vol. 3361, no. 1, June 2012, pp. 1–17, doi:10.11646/zootaxa.3361.1.1.