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\begin{thebibliography}{1}

\bibitem{DriLetter}
Vladimir Drinfeld, Letter to V.~Schechtman, October~1988.

\bibitem{Man88Gau}
Yu.~I. Manin, \emph{Gauge field theory and complex geometry}, Grundlehren der
  Mathematischen Wissenschaften [Fundamental Principles of Mathematical
  Sciences], vol. 289, Springer-Verlag, Berlin-New York, 1988, Translated from
  the Russian by N. Koblitz and J. R. King.

\end{thebibliography}