\begin{thebibliography}{3}
\providecommand{\natexlab}[1]{#1}
\providecommand{\url}[1]{\texttt{#1}}
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  \providecommand{\doi}[1]{doi: #1}\else
  \providecommand{\doi}{doi: \begingroup \urlstyle{rm}\Url}\fi

\bibitem[Ang(2007)]{bem_2007}
Whye-Teong Ang.
\newblock \emph{A Beginner’s Course in Boundary Element Methods}.
\newblock Cambridge University Press, New York, 2007.

\bibitem[Vinayan and Kinnas(2007)]{vinayan2007}
V.~Vinayan and S.~A. Kinnas.
\newblock A bem for the propagation of nonlinear planar free-surface waves.
\newblock \emph{Electronic Journal of Boundary Elements}, 5:\penalty0 17--40,
  2007.

\bibitem[Yang(2004)]{yang2004}
Jinghai Yang.
\newblock \emph{Time domain, nonlinear theories on ship motions}.
\newblock PhD thesis, University of Hawaii, 2004.

\end{thebibliography}