Radiative return at NLO and the measurement of the hadronic cross-section in electron--positron annihilation G. Rodrigo, H. Czyż, J.H. Kühn and M. Szopa Eur. Phys. J. C, 24 1 (2002) 71-82 Published online: 15 May 2002 DOI: 10.1007/s100520200912