Absolute Branching Fraction Measurements of Exclusive D^0 Semileptonic   Decays
  With the first data sample collected by the CLEO-c detector at the psi(3770) resonance we have studied four exclusive semileptonic decays of the D0 meson. Our results include the first observation and absolute branching fraction measurement for D0 --> rho- e+ nu_e and improved measurements of the absolute branching fractions for D0 decays to K- e+ nu_e, pi- e+ nu_e, and K*- e+ nu_e. 
T. E. Coan, et al. (CLEO Collaboration)