“…In Bampi & Caviglia (1983), there is some discussion for spaces with dimension n > 4 †; however, this is for a parallel existence problem (which is shown to be equivalent to the existence problem for potentials of Weyl † Bampi & Caviglia (1983) state, for the parallel problem which disregards the cyclic properties of the Weyl & Lanczos tensors respectively, that, under generic conditions, a potential can exist only in spaces with dimension n 6; this has lead to the incorrect statement that the Lanczos potential for a Weyl candidates only in four dimensions), and so we believe that it is still an open question whether there exist potentials with the properties (1.2) and (1.4) which satisfy the n-dimensional generalization of (1.3) for Weyl tensors in spaces with dimension n > 4. Although we shall not deal directly with the results in this paper, we draw attention to other recent related work: Hammon & Norris (1993) consider the Lanczos potential and, in particular, the question of gauge, in a still more general geometric setting; Torres del Castillo (1995) has obtained Lanczos potentials for a large class of spacetimes, including the Kerr metric, by spinor means; Ares de Parga et al (1989) and López-Bonilla et al (1993) have obtained expressions for the Lanczos potentials of some special spacetimes, in the spin coefficient formalism of Newman & Penrose (1962); it has been shown that the Riemann tensor cannot, in general, be written in terms of a Lanczos potential, by Massa & Pagani (1984) (in four dimensions) and by Edgar (1994b)…”