Quasi-periodic and periodic solutions of the Toda lattice via the hyperelliptic sigma function

Kodama, Yuji; Matsutani, Shigeki; Previato, Emma

Annales de l'Institut Fourier, Volume 63 (2013) p. 655-688

On the Birkhoff normal form of a completely integrable hamiltonian system near a fixed point with resonance

Kappeler, Thomas; Kodama, Yuji; Némethi, Andras

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Volume 26 (1998) p. 623-661