Marsch, E. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
Tu, C.-Y., Marsch, E., & Qin, Z.-R. (2004). Dependence of the proton beam drift velocity on the proton core plasma beta in the solar wind. Journal Geophysical Research, 109: A05101. doi:10.1029/2004JA010391.