Final-state radiation in electron-positron annihilation into a pion pairS. Dubinsky, A. Korchin, N. Merenkov, G. Pancheri and O. ShekhovtsovaEur. Phys. J. C, 40 1 (2005) 41-54DOI: https://doi.org/10.1140/epjc/s2004-02109-7