2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15365Highly personalysed and subjective review of studies of the equilibrium, pulsations and stability of stars with the first-order phase transition.4 pages, 1 fig, revtex. Essays on Gravitation-99, Gravity Research Foundation, USAAstrophysicsGeneral Relativity and Quantum CosmologyHistory and Philosophy of Physicstext