Klapdor-Kleingrothaus, H. V. Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;
Klapdor-Kleingrothaus, H. V. (2003). To be or not to be? - First evidence for neutrinoless double-beta decay. International Journal of Modern Physics A., 18 (22), 4113-4128.