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\section{CONCLUDING REMARKS}
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\begin{thebibliography}{99}
\bibitem{u}
C. L. Kane and E. J. Mele, Phys. Rev. Lett. 90, 207401
(2003).
\bibitem{o}
A. Marini, C. Hogan, M. Grüning, and D. Varsano, Comput.
Phys. Commun. 180, 1392 (2009).
\bibitem{q}
M. Shishkin and G. Kresse, Phys. Rev. B 75, 235102 (2007).
\bibitem{r}
M. van Schilfgaarde, T. Kotani, and S. Faleev, Phys. Rev.
Lett. 96, 226402 (2006).
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