Reference Frames and Rigid Motions in Relativity: ApplicationsD. Soler · 2006

A relativistic generalisation of rigid motionsJ. Llosa, A. Molina, D. Soler · 2012

Three-Dimensional Metrics as Deformations of a Constant Curvature MetricB. Coll; J. Llosa; D. Soler · General Relativity and Gravitation · 2002