Biström, Olof, Anders Nilsson, and Günther Wewalka. “A Systematic Review of the Tribes Hyphydrini Sharp and Pachydrini N. Trib. (Coleoptera, Dytiscidae)”. Entomologica Fennica 8, no. 2 (June 1, 1997): 57–82. Accessed December 23, 2024. https://journal.fi/entomolfennica/article/view/83921.