Lattices and Choquet's theorem
In: Journal of Functional Analysis, Vol. 1974, page 377-387
The Lie algebra structure of degenerate Hamiltonian and Bi-Hamiltonian systems
In: Progress of Theoretical Physics, Vol. 1982, page 1082-1104
The Lie algebra structure of nonlinear evolution equations admitting infinite dimensional abelian symmetry groups
In: Progress of Theoretical Physics, Vol. 1981, page 861-876
Linear aspects in the theory of solitons and nonlinear integrable equations
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