Fractional Free Volume Dependence of Neutron-Irradiated Polystyrene (PS) Measured by Positron Method. Iraqi Journal of Physics, [S. l.], v. 7, n. 10, p. 35–39, 2009. Disponível em: https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/880.. Acesso em: 18 may. 2024.