%0 Journal Article %A Hongliang Liu %A Haibo Chen %A Gangwei Wang %T Multiplicity for a 4-sublinear Schrödinger–Poisson system with sign-changing potential via Morse theory %J Comptes Rendus. Mathématique %D 2016 %P 75-80 %V 354 %N 1 %I Elsevier %R 10.1016/j.crma.2015.10.018 %G en %F CRMATH_2016__354_1_75_0