Asymptotic Stability with Rate Conditions Neil Fenichel Indiana University Mathematics Journal 1974 text pdf 10.1512/iumj.1974.23.23090 10.1512/iumj.1974.23.23090 en Indiana Univ. Math. J. 23 (1974) 1109 - 1137 state-of-the-art mathematics http://iumj.org/access/