Haase, M. et al. 2021. On the origin and diversification of the stygobiotic freshwater snail genus Hauffenia (Caenogastropoda: Hydrobiidae) with special focus on the northern species and the description of two new species. European Journal of Taxonomy. 775, 1 (Oct. 2021), 143–184. DOI:https://doi.org/10.5852/ejt.2021.775.1555.