Christensen, U. R. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Petrovay, K., & Christensen, U. R. (2010). The magnetic Sun: Reversals and long-term variations. Space Science Reviews, 155, 371-385. doi:10.1007/s11214-010-9657-8.