1. Dothan, Y., Gell-Mann, M., and Ne'eman, Y. (1965).Phys. Lett.,17, 148.
2. Hehl, F. W., von der Heyde, P., Kerlick, G. D., and Nester, J. M. (1976).Rev. Mod. Phys.,48, 393.
3. Hehl, F. W., Lord, E. A., and Ne'eman, Y. (1978).Phys. Rev.,D 17, 428.
4. Hehl, F. W., Ne'eman, Y., Nitsch, J., and von der Heyde, P. (1978).Phys. Lett.,78B, 102.
5. Hehl, F. W., Nitsch, J., and von der Heyde, P. (1979).Gravitation and Poincaré Gauge Field Theory with Quadratic Lagrangian: Einstein Commemorative Volume, eds. Held, A., et al. (Plenum Press, New York), to be published.