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. (2008). Loss of the surface layers of comet nuclei. Space Science Reviews, 138(1-4), 165-177. doi:10.1007/s11214-008-9332-5.