Generalization of Okamoto's equation to arbitrary $2\times 2$ Schlesinger systems

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L. Schlesinger, Über eine Klasse von Differentialsystemen beliebiger Ordnung mit festen kritischen Punkten
1912
Earlier work this paper cites.
K. Takasaki, Gaudin model, KZB equation, and isomonodromic problem on torus
Original
1963
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M. Jimbo, T. Miwa, Y. Môri, and M. Sato, Density matrix of an impenetrable Bose gas and the fifth Painlevé transcendent
1980
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M. Jimbo, T. Miwa, and K. Ueno, Monodromy preserving deformation of linear ordinary differential equations with rational coefficients
1981
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K. Okamoto, Isomonodromic deformation and the Painlevé equations and the Garnier system
1986
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K. Okamoto, Studies on the Painlevé equations I, sixth Painlevé equation 𝐏 𝐕𝐈 P_{{\rm VI}}
1987
Cited alongside, same era.
M.L. Kontsevich, Virasoro algebra and Teichmuller spaces
1987
Cited alongside, same era.
S. Kawai, Isomonodromic deformation of Fuchsian-type projective connections on elliptic curves
1997
Cited alongside, same era.
A.M. Levin and M.A. Olshanetsky, Hierarchies of isomonodromic deformations and Hitchin systems
1999
Cited alongside, same era.

J. Harnad, Virasoro generators and bilinear equations for isomonodromic tau functions
2002
Later among the works it cites.
M. Mazzocco, Irregular isomonodromic deformations for Garnier systems and Okamoto’s canonical transformations
2004
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B. Dubrovin and M. Mazzocco, Canonical structure and symmetries of the Schlesinger equations
2007
Later among the works it cites.
D. Korotkin and H. Samtleben, On the quantization of isomonodromic deformations on the torus,
2013
Closest in time.