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;
Christensen, U. R., & Olson, P. (2003). Secular variation in numerical geodynamo models with lateral variations of boundary heat flow. Physics of The Earth and Planetary Interiors, 138, 39-54. doi:10.1016/S0031-9201(03)00064-5.