Literature references

3 literature references:

Author: Seitler,H.
Year: 1977
Title:
Source: Die Flora des Furstentums Liechtenstein
Author: Langhe,J.-E.de et al.
Year: 1983
Title:
Source: Nouvelle Flore..Belgique,..Luxembourg,..Nord de la France...
Author: Hess,H.E. et al.
Year: 0
Title:
Source: Flora Der Schweiz,Band 2. Birkhauser.