Smolla, Marco Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Smolla, M., Schäfer, B., Lesch, H., & Beck, C. (2020). Universal properties of primary and secondary cosmic ray energy spectra. New Journal of Physics, 22(9): 093002. doi:10.1088/1367-2630/abaa03.