Gevrey regularizing effect for the (generalized) Korteweg-de Vries equation and nonlinear Schrödinger equations Anne de Bouard; Nakao Hayashi; Keiichi Kato — 1995 Annales de l'I.H.P. Analyse non linéaire
On the scattering in Gevrey classes for the subcritical Hartree and Schrödinger equations Nakao Hayashi; Keiichi Kato; Pavel I. Naumkin — 1998 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze