Experimental Study of the Radiative Decays K+ -> mu+ nu e+e- and K+ ->   e+ nu e+e-
  Experiment 865 at the Brookhaven AGS obtained 410 K+ -> e+ nu e+e- and 2679 K+ -> mu+ nu e+e- events including 10% and 19% background. The branching ratios were measured to be (2.48+-0.14(stat.)+-0.14(syst.))x10^-8 (m_ee>150 MeV) and (7.06+-0.16+-0.26)x10^-8 (m_ee>145 MeV), respectively. Results for the decay form factors are presented. 
A. A. Poblaguev (4), R. Appel (6,3), G. S. Atoyan (4), B. Bassalleck   (2), D. R. Bergman (6), N. Cheung (3), S. Dhawan (6),...