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\begin{thebibliography}{1}

\bibitem{B-1}
{\scshape F.~A. Bogomolov} -- {\og Abelian subgroups of {G}alois groups\fg},
  \emph{Izv. Akad. Nauk SSSR Ser. Mat.} \textbf{55} (1991), no.~1, p.~32--67.

\bibitem{B-3}
{\scshape F.~A. Bogomolov} -- {\og On two conjectures in birational algebraic
  geometry\fg}, in \emph{Algebraic geometry and analytic geometry (Tokyo,
  1990)}, ICM-90 Satell. Conf. Proc., Springer, Tokyo, 1991, p.~26--52.

\bibitem{BT}
{\scshape F.~A. Bogomolov {\normalfont \smfandname} Y.~Tschinkel} -- {\og
  Commuting elements in {G}alois groups of function fields\fg}, in
  \emph{Motives, Polylogarithms and Hodge theory}, International Press, 2002,
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\bibitem{bourb}
{\scshape N.~Bourbaki} -- \emph{Commutative algebra. {C}hapters 1--7}, Elements
  of Mathematics, Springer-Verlag, Berlin, 1998, Translated from the French,
  Reprint of the 1989 English translation.

\bibitem{efrat}
{\scshape I.~Efrat} -- {\og Construction of valuations from {$K$}-theory\fg},
  \emph{Math. Res. Lett.} \textbf{6} (1999), no.~3-4, p.~335--343.

\bibitem{mihalek72}
{\scshape R.~J. Mihalek} -- \emph{Projective geometry and algebraic
  structures}, Academic Press, New York, 1972.

\bibitem{mochizuki}
{\scshape S.~Mochizuki} -- {\og The local pro-{$p$} anabelian geometry of
  curves\fg}, \emph{Invent. Math.} \textbf{138} (1999), no.~2, p.~319--423.

\bibitem{pop}
{\scshape F.~Pop} -- {\og On {G}rothendieck's conjecture of birational
  anabelian geometry\fg}, \emph{Ann. of Math. (2)} \textbf{139} (1994), no.~1,
  p.~145--182.

\bibitem{ZS}
{\scshape O.~Zariski {\normalfont \smfandname} P.~Samuel} -- \emph{Commutative
  algebra. {V}ol. {II}}, Springer-Verlag, New York, 1975, Reprint of the 1960
  edition, Graduate Texts in Mathematics, Vol. 29.

\end{thebibliography}
