Reference

Sigrid Berger, Ulrike Fettweiss, Stefan Gleissberg, Larry B. Liddle, Ursula Richter, Heiko Sawitzky, Giuseppe C. Zuccarello (2003): Evolution of development in Polyphysaceae (=Acetabulariaceae, Chlorophyta) – Palmarum Hortus Francofortensis - Wissenschaftliche Berichte – 7_2003: 129.