MathSciNet bibliographic data MR1219264 35K25 (35B40) Li, X.; Wong, R. Asymptotic behaviour of the fundamental solution to $\partial u/\partial t=-(-\Delta)^mu$$\partial u/\partial t=-(-\Delta)^mu$. Proc. Roy. Soc. London Ser. A 441 (1993), no. 1912, 423–432. Article

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