2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/118936Using the Post-Minkowskian formalism and considering rotation as a perturbation, we compute an approximate interior solution for a stationary perfect fluid with constant density and axial symmetry. A suitable change of coordinates allows this metric to be matched to the exterior metric to a particle with a pole-dipole-quadrupole structure, relating the parameters of both.11 pages, english versionGeneral Relativity and Quantum Cosmologytext