T. Kappeler, J. Pöschel
KdV & KAM, Springer, 2003
Reprint: Higher education Press, Beijing, to appear in 2010
Russian translation: KdV & KAM, Regular and Chaotic Dynamics, Moscow, 2008
B. Grébert, T. Kappeler, J. Pöschel
Normal form theory for the NLS equation, preliminary version, arXiv
D. Burghelea, L. Friedlander, T. Kappeler
Witten deformation of the de Rham complex, in preparation