Topics in nuclear physics II: Lecture Notes for International Winter School in Nuclear Physics Held at Beijing(Peking) The People's Republic of China, December 22, 1980 January 9, 1981 - Ehlers J.; Hepp K.; Kippenhahn R.; Weidenmuller H. A.; Zittartz J.; Kuo T. T. S. (Lecture Notes in Physics Vol. 145)