Dejak, S. I., Lushnikov, P. M., Ovchinnikov, Y. N., & Sigal, I. M. (2012). On spectra of linearized operators for Keller-Segel models of chemotaxis. Physica D-Nonlinear Phenomena, 241(15), 1245-1254. doi:10.1016/j.physd.2012.04.003.