Oliveira H.P. de Spinning fluids in general relativity: a variational formulation / H.P. deOliveira,J.M.Salim, 1990. - 13 p. - Текст : непосредственный.
Gemetrized instantos and the creation of the universe / M.Novello,L.A.R.Oliveira,J.M.Salim,E.Elbaz, 1991. - 73 p. - Текст : непосредственный.