Covariant determination of the Weyl tensor geometry (Ferrando, Morales & Sáez 2001) PDF

Intrinsic characterization of space-time symmetric tensors (Bona, Coll & Morales 1992) PDF

Two-perfect fluid interpretation of an energy tensor (Ferrando, Morales & Portilla 1990) PDF

A method to obtain shear free two-fluid solutions of Einstein equations (Ferrando, Morales & Portilla 1989) PDF