1. M. Quiròs, F.J. de Urries, J. Hoyos, M.L. Mazòn and E. Rodriguez, Geometrical structure of Faddeev-Popov fields and invariance properties of gauge theories, Madrid preprint.
2. Explicit classical construction of the Faddeev-Popov ghost field
3. J. Math. Phys. (NY), to be published.
4. M. Quiròs and F.J. de Urries, New generalized Ward-Takahashi identities in gauge theories, Madrid preprint.