佐藤理論
Konopelchenko, B. G., & Oevel, W. (1991). Matrix Sato theory and integrable equations in 2+ 1 dimensions. Nonlinear Evolution Equations and Dynamical Systems, 91, 87-96.
Strampp, W., & Oevel, W. (1990). Recursion operators and Hamiltonian structures in Sato's theory. Letters in Mathematical Physics, 20(3), 195-210.