%0 Journal Article %A Grzegorz Łysik %T Nonanalyticity of solutions to $\partial _{t}u=\partial _{x}^2u+u^2$ %J Colloquium Mathematicum %D 2003 %P 255-266 %V 95 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm95-2-9/ %R 10.4064/cm95-2-9 %G en %F 10_4064_cm95_2_9