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In this article, we investigate the existence and multiplicity of solutions of Schrödinger-Poisson systemwhere the potential k(x) allows sign changing. We obtain the existence and multiplicity of solutions for the system, which can be regarded as complementary work of Huang et al. (2013) [12].

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We investigate the existence of (multiple) solutions of differential systems of Josephson-type with unbounded or periodic nonlinearities. Some new results are obtained and some results in the literature are improved.