Völk, H. J. Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;
Berezhko, E. G. Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;
Völk, H. J., Berezhko, E. G., & Ksenofontov, L. T. (2007). New evidence for strong nonthermal effects in Tycho's supernova remnant. Astrophysics and Space Science, 309(1-4), 389-394.