MARKII_1979_I144382
Measurement of the mass spectrum for $\pi^+\pi^-$ in $\psi(2S)\to\pi^+\pi^-J/\psi$ decays by the MARK-II experiment.
Measurement of the mass spectrum for $\pi^+\pi^-$ in $\psi(2S)\to\pi^+\pi^-J/\psi$ decays by the MARK-II experiment.
