The European Physical Journal A The European Physical Journal A, 2020, 56 (11), pp.291. ⟨10.1140/epja/s10050-020-00297-4⟩ The European Physical Journal A, Springer, 2020, 56 (11), pp.291. ⟨10.1140/epja/s10050-020-00297-4⟩ European Physical Journal A European Physical Journal A, EDP Sciences, 2020, 56 (11), pp.291. ⟨10.1140/epja/s10050-020-00297-4⟩