By analytically solving a corrected balance between the force given by
the Newton’s 2nd law and the Newton gravitational force in polar
coordinates, an equation for the intrinsic (i.e. two-body problem) perihelion precession of the planets of the solar system was
obtained that when the Kepler’s 3rd law is applied it coincides with
the equation resulting from Einstein GTR.
Einstein, A. (1916)
The Foundation of the Generalized Theory of Relativity. Translated by Satyendra
Nath Bose, Wikisource. [German Original: Die Grundlage der allgemeinen Relativitatstheorie]. Annalen der Physik, 354,