Grupp, Frank Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Wu, X., Wang, L., Shi, J., Zhao, G., & Grupp, F. (2015). Palladium and silver abundances in stars with [Fe/H] > –2.6. Astronomy & Astrophysics, 579: A8, pp. 1-15. doi:10.1051/0004-6361/201525679.