Agustín de Betancourt’s Double-Acting Steam Engine: Geometric Modeling and Virtual Reconstruction.Published in:Symmetry (20738994), 2018, v. 10, n. 8, p. 351, doi. 10.3390/sym10080351By:Rojas-Sola, José Ignacio;Galán-Moral, Belén;De la Morena-De la Fuente, EduardoPublication type:Article