Generalized Heat Transfer between Solids and Gases under Nonlinear Boundary Conditions Avner Friedman Indiana University Mathematics Journal 1959 text pdf 10.1512/iumj.1959.8.58012 10.1512/iumj.1959.8.58012 en Indiana Univ. Math. J. 8 (1959) 161 - 183 state-of-the-art mathematics http://iumj.org/access/