A. P. Betteridge, Y. Gao, M. G. Green, D. L. Johnson, P. V. March et al., Strong Department o f P h ysics

P. Johnson, A. M. Litke, G. Taylor, and J. , Wear Institute for Particle Physics

F. Dipartimento-di, Universit a d i T rieste e INFN Sezione di Trieste, p.34127

D. Buskulic, ALEPH Coll., following letter, preprint CERN-PPE, pp.94-059

D. D. Ecamp, ALEPH: A detector for electron-positron annihilations at LEP, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol.294, issue.1-2, p.121, 1990.
DOI : 10.1016/0168-9002(90)91831-U

M. Battle, Measurement of Cabibbo-suppressed decays of the lepton, Cornell University preprint CLNS 94, p.1273, 1994.