MathSciNet bibliographic data MR2103197 35K57 (35K45 92E20) Dolbeault, Jean; Perthame, Benoît Optimal critical mass in the two-dimensional Keller-Segel model in \$\Bbb R\sp 2\$$\Bbb R\sp 2$. C. R. Math. Acad. Sci. Paris 339 (2004), no. 9, 611–616. Article

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