Barnard, C.J., Kulis, K., Behnke, J.M., Bajer, A., Gromadzka-Ostowska, J., Stachon, M. and Sinski, E. (2003) Local Variation in Helminth Burdens of Bank Voles (Clethrionomys glareolus) from Ecologically Similar Sites: Temporal Stability and Relationships with Hormone Concentrations and Social Behaviour. Helminthology, 77, 185-195.