John, D. M., Wynne, M. J., & Tsarenko, P. M. (2014).

Reinstatement of the genus Willea Schmidle 1900 for Crucigeniella Lemmermann 1900 nom. illeg. (Chlorellales, Trebouxiophyceae, Chlorophyta)

. Phytotaxa, 167(2), 212–214. https://doi.org/10.11646/phytotaxa.167.2.10