Müller-Starck, G., & Ziehe, M. (1991). Genetic variation in populations of Fagus sylvatica L., Quercus robur L., and Q. petraea Liebl. in Germany. In G. Müller-Starck & M. Ziehe (Eds.), Genetic variation in European populations of forest trees (pp. 125-140). J.D. Sauerländer Verlag.