\begin{thebibliography}{1}

\bibitem{Hoffmann:JACS:1965:4389}
Roald Hoffmann and R.~B. Woodward.
\newblock {Orbital Symmetries and Orientational Effects in a Sigmatropic
  Reaction}.
\newblock {\em J. Am. Chem. Soc.}, 87(19):4389--4390, 1965.

\bibitem{Najera:ChemRev:2007}
C.~Najera and J.M. Sansano.
\newblock Catalytic asymmetric synthesis of $\alpha$-amino acids.
\newblock {\em Chem. Rev.}, 107(11):4584--4671, 2007.

\end{thebibliography}
