J. Martin, A. Molina, E. Ruiz, F.L. Atrio con Relativity and Gravitation in General: Proceedings of the Spanish Relativity Meeting in Honour of the 65th Birthday of Lluís Bel. Salamanca, Spain, 22-25 September 1998
The proceedings of the 1998 Spanish relativity meeting in honour of Lluis Bel contain several topics which Bel and his collaborators have worked on, namely the superenergy tensor and frames of reference. There are also many communications on cosmology, mathematical relativity and gravitational collapse.