Literature references
2 literature references:
| Author: | Hegi, G. |
|---|---|
| Year: | 1981 |
| Title: | Illustrierte Flora von Mittel-europa, Band 1, Teil 2 [third edition] |
| Source: | Verlag Paul Parey, Berlin - Hamburg |
| Author: | Krüssmann, G. |
|---|---|
| Year: | 1983 |
| Title: | Handbuch der Nadelgehölze, 2. Auflage |
| Source: | Paul Parey, Berlin & Hamburg |