Thermoelastic Stresses in a Slab Charles MartinRobert Payton Indiana University Mathematics Journal 1964 text pdf 10.1512/iumj.1964.13.13001 10.1512/iumj.1964.13.13001 en Indiana Univ. Math. J. 13 (1964) 1 - 30 state-of-the-art mathematics http://iumj.org/access/