1. Cave ecology and the evolution of troglobites;Barr;Evolutionary Biology,1968
2. Evolutionary rates and phylogenetic age in some stygobiontic species;Boutin,2000
3. Proposition pour la classification des animaux cavernicoles;Christiansen;Spelunca,1962
4. Behavior and form in the evolution of cave Collembola;Christiansen;Evolution,1965
5. Adaptation: Morphological (external);Christiansen,2004