We study a degenerate parabolic equation derived from the kinetic theory using R\'enyi-Tsallis entropy with the critical exponent. In this paper, we show the existence of the threshold mass for a solution blowing up in finite time.
"Degenerate parabolic equation with critical exponent derived from the kinetic theory. II. Blowup threshold." Differential Integral Equations 22 (11/12) 1153 - 1172, November/December 2009.