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A stress-strain equation is studied which uses a non-Gaussian statistical mechanics model for large deformation of crosslinked rubbers. The formulation is based on the work introduced by Doi and Edwards for the description of polymer dynamics in a fixed network. The resulting constitutive equation is applied in the entire network of elastomers. Uniaxial and biaxial tensile and compressive experiments are explained in detail. Comparison with other theoretical work reveals that the present model could be applied equivalently in any kind of physical or chemical network junction.