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In this paper, we investigate the Klein-Gordon-Schrodinger (KGS) system with higher order Yukawa coupling in spatial dimensions N >= 3. We establish a perturbed virial type identity and prove blowup results relied on Lyapunov functionals for KGS system with a negative energy level. Additionally, we give a result with respect to the blowup rate in finite time for the radial solution in 3 spatial dimensions. (C) 2015 AIP Publishing LLC.
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