1. W. Heisenberg:Nachr. d. Göttinger Akad. d. Wiss., 111 (1953);
2. H. P. Dürr, W. Heisenberg, H. Mitter, S. Schlieder andK. Yamazaki:Zeits. Natur.,14a, 441 (1959). For a review of the older work seee.g.,W. Heisenberg:Introduction to the Unified Field Theory of Elementary Particles (London, 1966);H. P. Dürr:Acta Phys. Austriaca, Suppl.,3, 3 (1966).
3. H. P. Dürr andN. J. Winter:Nuovo Cimento,70 A, 467 (1970).
4. H. Mitter:Nuovo Cimento,32, 1789 (1964).
5. H. P. Dürr:Zeits. Natur. 16 a, 327 (1961).