Axford, W. I. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Zank, G. P., & Axford, W. I. (1997). The origin of the GCRII component. In M. S. Potgieter, B. C. Raubenheimer, & D. J. van der Walt (Eds.), Proc. 25th International Cosmic Ray Conference, Durban, S. A., 30 July-06 August 1997 (pp. 473-476). Potchefstroom, South Africa: Wesprint.