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\newblock {\em {IEEE} Trans.{\ }Power Delivery}, vol. 3, no. 2, pp. 549--557,
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\bibitem{citebook}
E.~Clark,
\newblock {\em Circuit Analysis of {AC} Power Systems}, vol.~I,
\newblock Wiley, New York, 1950.

\bibitem{citeconference}
J.~L. Alqueres and J.~C. Praca,
\newblock ``The brazilian power system and the challenge of the {A}mazon
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\newblock in {\em Proceedings of the 1991 Power Engineering Society
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\end{thebibliography}