Reference

Hanus [Hans] Ettl, Moestrup (1980): Light and Electron Microscopical Studies on Hafniomonas gen. nov. (Chlorophyceae, Volvocales), a Genus Resembling Pyramimonas (Prasinophyceae) – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 135: 177 - 210.