  The pulsar timing residuals induced by gravitational waves from non-evolving
single binary sources with general elliptical orbits will be analyzed. For
different orbital eccentricities, the timing residuals present different
properties. The standard deviations of the timing residuals induced by a fixed
gravitational wave source will be calculated for different values of the
eccentricity. We will also analyze the timing residuals of PSR J0437-4715
induced by one of the best known single gravitational wave sources, the
supermassive black hole binary in the blazar OJ287.
