Algebraic and Analytic Aspects of Integrable Systems and ...
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MR851569(89b:34012) Michio Jimbo and Tetsuji Miwa, Monodromy preserving
deformation of linear ordinary differential equations with rational coefficients. II,
Phys. D 2 (1981), no. 3, 407–448, DOI 10.1016/0167-2789(81)90021-X.