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\begin{thebibliography}{1}

\bibitem{b}
N.~Bourbaki, \emph{Algebra {I}. {C}hapters 1--3}, Elements of Mathematics
  (Berlin), Springer-Verlag, Berlin, 1998, Translated from the French, Reprint
  of the 1989 English translation [ MR0979982 (90d:00002)].

\bibitem{f}
J.B. Fraleigh, \emph{A {F}irst {C}ourse in {A}bstract {A}lgebra, {S}eventh
  {E}dition}, Addison {W}esley, Boston, 2003.

\bibitem{g}
J.A. Gallian, \emph{Contemporary {A}bstract {A}lgebra, {T}hird {E}dition}, D.C.
  Heath, Toronto, 1994.

\bibitem{groth}
Alexander Grothendieck, \emph{Cohomologie locale des faisceaux coh\'erents et
  th\'eor\`emes de {L}efschetz locaux et globaux ({SGA} 2)}, Documents
  Math\'ematiques (Paris) [Mathematical Documents (Paris)], 4, Soci\'et\'e
  Math\'ematique de France, Paris, 2005, S\'eminaire de G\'eom\'etrie
  Alg\'ebrique du Bois Marie, 1962, Augment\'e d'un expos\'e de Mich\`ele
  Raynaud. [With an expos\'e by Mich\`ele Raynaud], With a preface and edited
  by Yves Laszlo, Revised reprint of the 1968 French original. \MR{MR2171939
  (2006f:14004)}

\end{thebibliography}
