Ip, W.-H. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Liu, Z. S., Ip, W.-H., & Pu, Z. Y. (1996). Scientific explorations of Mars. In Li, H. S., & others (Eds.), Trends of Scientific Developments at the Turn of the 21st Century (pp. 237-239). Beijing: Scientific Publishing House.