Normal forms for Hamiltonian systems with Poisson commuting integrals - elliptic case. L.H. Eliasson — 1990 Commentarii mathematici Helvetici
Absolutely convergent series expansions for quasi periodic motions. Eliasson, L.H. — 1996 Mathematical Physics Electronic Journal [electronic only]
Reducibility and point spectrum for linear quasi-periodic skew-products. Eliasson, L.H. — 1998 Documenta Mathematica