Limits on Neutral D Mixing in Semileptonic Decays
  Using the CLEO II.V detector observing e+e- collisions at around 10.6 GeV we search for neutral D mixing in semileptonic D0 decays tagged in charged D* decays. Combining the results from the Kenu and K*enu channels we find that the rate for D mixing is less than 0.0078 at 90% C.L. 
C. Cawlfield, et al, CLEO Collaboration