Keller, H. U. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Thomas, N., Alexander, C., & Keller, H. U. (2009). Loss of the Surface Layers of Comet Nuclei. In H. Balsiger, K. Altwegg, W. Huebner, T. Owen, & R. Schulz (Eds.), Origin and Early Evolution of Comet Nuclei (pp. 165-177). New York, USA: Springer.