1. Proc. Int. Conf. on symmetries and quark models;Nambu,1969
2. 15th Int. Conf. on high energy physics;Nielsen,1970
3. Dual-symmetric theory of hadrons.—I
4. Lectures at the Copenhagen Summer Symposium;Nambu,1970
5. Dynamics underlying duality and gauge invariance in the dual resonance model;Chang,1971