Ip, W.-H. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Ip, W.-H. (1997). Recent results in cometary research. In K. S. Cheng, & K. L. Chan (Eds.), Proc. 21st Century Chinese Astronomy Conf., Hong Kong 1996 (pp. 366-369). Singapore: World Scientific Publ. Co.