Master equations in the microscopic theory of nuclear collective dynamics: Fumihiko Sakata. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo, 188, Japan; Masayuki Matsuo. Cyclotron Laboratory, RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-01, Japan; Toshio Marumori. Institute of Physics, University of Tsukuba, Ibaraki 305, Japan; Yizhong Zhuo. Institute of Atomic Energy, P.O. Box 275, Beijing, China