Erpenbeck, D., O. Voigt, M. Gültas, and G. Wörheide. “The Sponge Genetree server—providing a Phylogenetic Backbone for Poriferan Evolutionary Studies”. Zootaxa, vol. 1939, no. 1, Nov. 2008, pp. 58–60, doi:10.11646/zootaxa.1939.1.6.