Blow up rate for semilinear heat equations with subcritical nonlinearity Yoshikazu GigaShin'ya MatsuiSatoshi Sasayama 35B4035K1535K5558J35semilinear heat equationblowup ratebootstrap argument Indiana University Mathematics Journal 2004 text pdf 10.1512/iumj.2004.53.2401 10.1512/iumj.2004.53.2401 en Indiana Univ. Math. J. 53 (2004) 483 - 514 state-of-the-art mathematics http://iumj.org/access/