Christian, E., Zicsi, A. (1999): Ein synoptischer Bestimmungsschlüssel der Regenwürmer Österreichs (Oligochaeta: Lumbricidae). [A synoptic key to the earthworms of Austria (Oligochaeta: Lumbricidae).] Die Bodenkultur, 50: 121-131.
Christiansen, K. (1992): Biological processes in space and time. Cave life in the light of modern evolutionary theory. In: Camacho, A.I. (ed.): The Natural History of Biospeleology. Museo Nacional de Ciencias Naturles, Madrid: 454-478
Christiansen, K., Doyle, M., Kahlert, M., Gobaleza, D. (1992):Interspecific interactions between collembolan populations in culture. Pedobiologia, 36: 274-286.