Etienne Kornobis; Snæbjörn Pálsson; Dmitry A. Sidorov; John R. Holsinger; Bjarni K. Kristjánsson (2011). "Molecular taxonomy and phylogenetic affinities of two groundwater amphipods, Crangonyx islandicus and Crymostygius thingvallensis, endemic to Iceland". Molecular Phylogenetics and Evolution. 58 (3): 527–539. doi:10.1016/j.ympev.2010.12.010. PMID21195201.
Etienne Kornobis; Snæbjörn Pálsson; Dmitry A. Sidorov; John R. Holsinger; Bjarni K. Kristjánsson (2011). "Molecular taxonomy and phylogenetic affinities of two groundwater amphipods, Crangonyx islandicus and Crymostygius thingvallensis, endemic to Iceland". Molecular Phylogenetics and Evolution. 58 (3): 527–539. doi:10.1016/j.ympev.2010.12.010. PMID21195201.