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K. Hattori, A generalization of Taub-NUT deformations, arXiv:1301.5424</li><li style="margin-left:15px">P. B. Kronheimer, A hyperkahler structure on the cotangent bundle of a complex Lie group, arXiv:math/0409253</li><li style="margin-left:15px">
H. Nakajima, Instantons on ALE spaces, quiver varieties, and Kac-Moody algebras, Duke Math. J. Volume 76, Number 2 (1994), 365-416.</li></ol></div><div style="font-family:arial,sans-serif;font-size:14px"><br></div><div style="font-family:arial,sans-serif;font-size:14px">
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