De hert, K., Jacquemyn, H., Van Glabeke, S., Roldán-Ruiz, I., Vandepitte, K., Leus, L., & Honnay, O. (2012). Reproductive isolation and hybridization in sympatric populations of three Dactylorhiza species (Orchidaceae) with different ploidy levels. Oxford University Press.

De hert, Koen, Hans Jacquemyn, Sabine Van Glabeke, Isabel Roldán-Ruiz, Katrien Vandepitte, Leen Leus, and Olivier Honnay. Reproductive Isolation and Hybridization in Sympatric Populations of Three Dactylorhiza Species (Orchidaceae) With Different Ploidy Levels. Oxford University Press, 2012.

De hert, Koen, et al. Reproductive Isolation and Hybridization in Sympatric Populations of Three Dactylorhiza Species (Orchidaceae) With Different Ploidy Levels. Oxford University Press, 2012.