Nielsen, E. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;
Nielsen, E., Whitehead, J. D., Hedberg, L. A., & Jones, T. B. (1983). A test of the cosine relationship using three-radar velocity measurements. Radio Science, 18, 230.