Painleve analysis and complete integrability of coupled Klein-Gordon equations

We apply the Painleve singularity structure analysis to the nonlinear coupled Klein-Gordon equations and to their hierarchies and find that they admit the Painleve property. Then, by truncating the Laurent series, we identify the Hirota bilinear form which is in agreement with the earlier results. Finally, N-coupled Klein-Gordon equations are identified. ((orig.))