The European Physical Journal A The European Physical Journal A, Springer, 2020, 56 (6), pp.159. ⟨10.1140/epja/s10050-020-00171-3⟩ Digital.CSIC. Repositorio Institucional del CSIC instname European Physical Journal A European Physical Journal A, EDP Sciences, 2020, 56 (6), pp.159. ⟨10.1140/epja/s10050-020-00171-3⟩ Eur.Phys.J.A Eur.Phys.J.A, 2020, 56 (6), pp.159. ⟨10.1140/epja/s10050-020-00171-3⟩