Clustering phenomena in nuclei. Invited lectures and contributed papers from the International Conference on Clustering Phenomena in Nuclei, held in Bochum, 21-24 July 1969, and organized by the Theoretical Physics Dept. of the University of Tübingen and the Physics Dept. of the University of Bochum. Supported by: the Ministry of Scientific Research of the Federal Republic of Germany and the International Atomic Energy Agency, Vienna. (Proceedings series)