Bounds of global solutions of parabolic problems with nonlinear boundary conditions Pavol QuittnerPhilippe Souplet 35B4535K60a priori estimatesuniversal estimatesglobal solutionsnonlinear boundary conditionsheat equation Indiana University Mathematics Journal 2003 text pdf 10.1512/iumj.2003.52.2353 10.1512/iumj.2003.52.2353 en Indiana Univ. Math. J. 52 (2003) 875 - 900 state-of-the-art mathematics http://iumj.org/access/