List of citations in Numdam for : Matter field space times admitting symmetry mappings satisfying vanishing contraction of the Lie deformation of the Ricci tensor

Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Volume 28 (1978) no. 2, pp. 197-206.

Oliver, D. R.; Davis, W. R.

Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Volume 30 (1979) no. 4, pp. 339-351.