Abbiendi G. 4 , Dienes B. 2 + 2 , Horváth D. 1 + 2 , Trócsányi Z. 2 + 2 , + 313 coauthors (OPAL Collaboration) 3 : Search for anomalous production of acoplanar di-lepton events in e+e collisions at sqrt(s) = 183 and 189 GeV.
SCI European Physical Journal C 14 (2000)51.-71./ 5.4082000;N
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