On the Monopole Model Of Form Factors for Heavy Meson Decays
  A pole model for the form factors describing heavy to light meson transitions is constructed, and the results compared with the predictions of the heavy quark effective theory (HQET). While most of the HQET-predicted relationships among form factors hold at the maximum value of $q^2$, many are violated, suggesting that the simplest version of the pole model of meson form factors should be used with caution, especially when combined with HQET. 
Winston Roberts