On the Smoothness of the Nonlinear Spectral Manifolds Associated to the Navier-Stokes Equations Ciprian FoiasJ. Saut Indiana University Mathematics Journal 1984 text pdf 10.1512/iumj.1984.33.33049 10.1512/iumj.1984.33.33049 en Indiana Univ. Math. J. 33 (1984) 911 - 926 state-of-the-art mathematics http://iumj.org/access/