1. H. Karoji andL. Nottale:Nature,259, 31 (1976).
2. H. Karoji, L. Nottale andJ. P. Vigier:Compt. Rend.,281 B, 409 (1975).
3. J. Jaakkola, H. Karoji, G. Le Denmat, M. Moles, L. Nottale, J. P. Vigier andJ. C. Pecker:Mont. Not. Roy. Astr. Soc., in press.
4. F. Zwicky, E. Herzog, P. Wild, M. Karpowicz andC. J. Kowal:Catalogue of Galaxies and of Clusters of Galaxies (Pasadena, Cal., 1961–1968).
5. C. C. Dyer andR. C. Roeder:Nature,260, 764 (1976).