1. Potamogetonaceae-fruit: I. Recent and subfossil endocarps of the Fennoscandinavian species;Aalto;Acta Bot. Fenn.,1970
2. Zadenatlas der Nederlandsche flora;Beijerinck,1947
3. Atlas of Seeds and Small Fruits of Northwest-European Plant Species with Morphological Descriptions, 2—Cyperaceae;Berggren,1969
4. Pilze der Schweiz. Bd. 1: Ascomyceten;Breitenbach,1981
5. Vegetationsformen der Gebüsche und Wälder;Clausnitzer,2001