Analysis of the decays ψ′ → J/ψπ + π − and η′c → η c π + π − with the heavy-quark symmetry Zhi-Gang Wang Eur. Phys. J. A, 47 8 (2011) 94 Published online: 11 August 2011 DOI: 10.1140/epja/i2011-11094-3
