Roll, Reinhard MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;
Roll, R., Witte, L., & Arnold, W. (2016). ROSETTA lander Philae - soil strength analysis. Icarus, 280, 359-365. doi:10.1016/j.icarus.2016.07.004.