Electronic Journal of Differential Equations, Vol. 2009(2009), No. 32, pp. 1-10. Title: Existence of multiple solutions for a nonlinearly perturbed elliptic parabolic system in $\mathbb{R}^2$ Authors: Michinori Ishiwata (Muroran Inst. of Technology, Japan) Takayoshi Ogawa (Tohoku Univ., Sendai, Japan) Futoshi Takahashi (Osaka City Univ., Japan) Abstract: We consider the following nonlinearly perturbed version of the elliptic-parabolic system of Keller-Segel type: $$\displaylines{ \partial_tu - \Delta u+ \nabla \cdot(u \nabla v)=0,\quad t>0,\; x\in\mathbb{R}^2, \cr -\Delta v+v-v^p=u,\quad t>0,\; x\in\mathbb{R}^2,\cr u(0,x) =u_0(x)\ge 0,\quad x\in\mathbb{R}^2, }$$ where $1