Deductive-reductive determination of the model of our observed Universe
  According to the observations, in our expansive and isotropic relativistic Universe for the gravitational phenomena in a Newtonian approximation the Newtonian non-modified relations are valid. The Friedmann general equations of isotropic and homogeneous universe dynamics describe an infinite number of models of expansive and isotropic relativistic universe in the Newtonian approximation, but only in one of them the Newtonian non-modified relations are valid. These facts give - till now not considered - possibility for unambiguous deductive-reductive determination of the Friedmannian model, which describes our observed Universe. 
V. Skalsky