A measurement of muon pair production in e+e- annihilation at centre of mass energies Mathematical expression GeV - Braunschweig, W; Gerhards, R; Kirschfink, F; Martyn, H; Bock, B; Fischer, H; Hartmann, H; Hartmann, J; Hilger, E; Jocksch, A; Wedemeyer, R; Foster, B; et al. (Springer-Verlag, 1989)