1. M. Planck, Preuss. Akad. Wiss., S.479–480 (1899)
2. K.A. Tomilin, Proceedings Of The XXII Workshop On High Energy Physics an Field Theory. pp. 287–296 (1999)
3. W. Heisenberg, Ann. Phys. 5, 32 (1938)
4. C.N. Yang, Phys. Rev. 72, 874 (1947)
5. S. Deser, Rev. Modern Phys. 29, 417–423 (1957)