On the Asymptotic Stability of Solutions of Parabolic Differential Equations R. Narasimhan Indiana University Mathematics Journal 1954 text pdf 10.1512/iumj.1954.3.53015 10.1512/iumj.1954.3.53015 en Indiana Univ. Math. J. 3 (1954) 303 - 313 state-of-the-art mathematics http://iumj.org/access/