Long, D. G., L. Söderström, A. Hagborg, and M. von Konrat. “Notes on Early Land Plants Today. 56. Validation of <em>Asterella</em> Sect. <em>Wallichianae</Em> (Aytoniaceae, Marchantiophyta)”. Phytotaxa, vol. 173, no. 1, June 2014, pp. 87–87, doi:10.11646/phytotaxa.173.1.8.