Reference
Stefanie Hübner, Volker Wissemann (2004): Morphometrische Analysen zur Variabilität von Prunus spinosa L. - Populationen (Prunoideae, Rosaceae) im Mittleren Saaletal, Thüringen Morphometric analysis on the variability of Prunus spinosa L. - populations (Prunoideae, Rosaceae) in the central valley of the river Saale, Thuringia – Forum Geobotanicum - An Electronic Journal of Geobotanical Research – 1: 19 - 51.