\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}

\usepackage{amssymb} % Just for \mathbb


\usepackage{xcolor}
\usepackage[colorlinks]{hyperref}
\makeatletter
\Hy@AtBeginDocument{%
  \def\@pdfborder{0 0 1}% Overrides border definition set with colorlinks=true
  \def\@pdfborderstyle{/S/U/W 1}% Overrides border style set with colorlinks=true
                                % Hyperlink border style will be underline of width 1pt
}
\makeatother
\hypersetup{%
  colorlinks=true,% hyperlinks will be coloured
  linkcolor=blue,% hyperlink text will be blue
  urlcolor=blue,% hyperlink text will be blue
  linkbordercolor=red,% hyperlink border will be red
  urlbordercolor=red,% hyperlink border will be red
}

%%\usepackage[backend=biber,style=alphabetic,citestyle=alphabetic,backref]{biblatex}
%%\addbibresource{biblatex-examples.bib}
%%\addbibresource{biblatex2bibitem-examples.bib}

%%\usepackage{biblatex2bibitem}
\usepackage{cite}

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

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

\newpage

\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 (cit. on
p. \hyperlink {page.1} {1}).
{}
\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 (cit. on p. \hyperlink {page.1} {1}).
{}
\bibitem{knuth:ct:e}
Donald E. Knuth. \emph{Computers \& Typesetting}. Vol. E:
\emph{{Computer Modern} Typefaces}. Reading, Mass.:
Addison-Wesley, 1986 (cit. on p. \hyperlink {page.1} {1}).{}
\bibitem{solymosi2010question}
Jozsef Solymosi and Frank De Zeeuw. ‘On a question\relax ~of Erdős
and Ulam’. In: \emph{Discrete \& Computational Geometry} 43.2
(2010), pp. 393–401. arXiv: \href {http://arxiv.org/abs/0806.3095_}
{\nolinkurl {0806.3095_}}. \textsc{url}: \url
{https://example.com/@%D1%80%D1%83%D1%81_} (cit. on
p. \hyperlink {page.1} {1}).
{}
\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}: \href
{https://doi.org/10.1002/(SICI)1096-987X(199803)19:4<377::AID-JCC1>3.0.CO;2-P}
{\nolinkurl
{10.1002/(SICI)1096-987X(199803)19:4<377::AID-JCC1>3.0.CO;2-P}}
(cit. on p. \hyperlink {page.1} {1}).
\end{thebibliography}

%%\printbibliography
%%\printbibitembibliography

\end{document}