Upper Limit on the Decay K+ --> e+ nu mu+ mu-
  An upper limit on the branching ratio for the decay K+ --> e+ nu mu+ mu- is set at 5.0 x 10^{-7} at 90% confidence level, consistent with predictions from chiral perturbation theory. 
E787 Collaboration: S. Adler, M. S. Atiya, I-H. Chiang, J. S. Frank,   J. S. Haggerty, T. F. Kycia, K. K. Li, L. S. Littenbe...