2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/1410The results of a previous paper by the author [Astrophys. J. 470, 43 (1996) are improved, through a more reliable technique for finding the location of sources whose images are on the surface of last scattering.8 pages, 2 figures. Presented at the IX Marcel Grossmann Meeting on General Relativity (Rome, 2-8 July, 2000)Astrophysicstext