Estimated Errors in |Vcd|/|Vcs| from Semileptonic D Decays
  We estimate statistical and systematic errors in the extraction of the CKM ratio |Vcd|/|Vcs| from exclusive D-meson semileptonic decays using lattice QCD and anticipated new experimental results. 
J.N. Simone, A.X. El-Khadra, S. Hashimoto, A.S. Kronfeld, P.B.   Mackenzie and S.M. Ryan