Reference
Jan Jansen, Miguel P.S. Menezes de Sequeira (1998-2001): The vegetation of shallow waters and seasonally inundated habitats (Littorelletea and Isoeto-Nanojuncetea) in the higher parts of the Serra da
Estrela, Portugal (1999) – Mitteilungen des Badischen Landesvereins für Naturkunde und Naturschutz e.V. Freiburg i. Br. – NF_17: 449 - 462.