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\cite{sigfridsson,knuth:ct:e}.

See also \cite{solymosi2010question,halbeisen2019geometric,Kohnert2006IntegralPS}.

\begin{thebibliography}{99}
{}
\bibitem{halbeisen2019geometric}
Lorenz Halbeisen and Norbert Hungerbühler. ‘A geometric
representation of integral solutions of $x^2+ xy+ y^2= m^2$’. In:
\emph{Quaestiones Mathematicae} (2019), pp. 1–15.
{}
\bibitem{knuth:ct:e}
Donald E. Knuth. \emph{Computers \&amp; Typesetting}. Vol. E:
\emph{{Computer Modern} Typefaces}. Reading, Mass.:
Addison-Wesley, 1986.
{}
\bibitem{Kohnert2006IntegralPS}
Axel Kohnert and Sascha Kurz. ‘Integral point sets over {$\mathbb
{Z}^m_n$}’. In: \emph{Discrete Applied Mathematics} 157 (2006),
pp. 2105–2117.
{}
\bibitem{sigfridsson}

Emma Sigfridsson and Ulf Ryde. ‘Comparison of methods for deriving
atomic charges from the electrostatic potential and moments’. In:
\emph{Journal of Computational Chemistry} 19.4 (1998), pp. 377–395.
\textsc{doi}: \nolinkurl
{10.1002/(SICI)1096-987X(199803)19:4&lt;377::AID-JCC1&gt;3.0.CO;2-P}.
{}
\bibitem{solymosi2010question}
Jozsef Solymosi and Frank De Zeeuw. ‘On a question\relax ~of Erdős
and Ulam’. In: \emph{Discrete \&amp; Computational Geometry} 43.2
(2010), pp. 393–401. arXiv: \nolinkurl {0806.3095_}. \textsc{url}: \url
{https://example.com/@%D1%80%D1%83%D1%81_}.
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