Völk, H.J. Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;
Völk, H., & Zirakashvili, V. (2004). Cosmic ray acceleration by spiral shocks in the galactic wind. Astronomy & Astrophysics, 417(3), 807-817. Retrieved from http://arxiv.org/abs/astro-ph/0401368.