  A system of linear homogeneous algebraic equations for coupling constant
ratios of vector-mesons to hadrons is derived by imposing an asymptotic
behaviuor upon the VMD pole parametrization of an hadron electromagnetic form
factor. A similar system of equations with a simpler structure of coefficients,
taken as even powers of vector-meson masses, is derived by means of integral
superconvergent sum rules for the imaginary part of the considered from factor
using its appropriate delta function approximation. Although both systems have
been derived starting from different properties of the electromagnetic form
factor and they look each in its own way, it is shown explicitly that they are
fully equivalent.
