\documentclass[a4paper]{article}
\usepackage[a4paper, total={20cm, 27cm}]{geometry}

\pagestyle{empty}

\usepackage[utf8]{inputenc}
\usepackage{hyperref}


\usepackage[
%backend=biber,
backend=bibtex,
style=alphabetic,
sorting=ynt
]{biblatex}
\addbibresource{/GW/root/bibtex/golem}

\title{The GOLEM tokamak bibliography}
\author{The tokamak GOLEM team}
%\date{}

\begin{document}

\maketitle

%IAEA.19
%\nocite{8876584,8876482,8824534,Dhyani_2019,JOFESvoboda2019,DhyaniEPS19,MachaEPS19}
%IAEA.20
\nocite{Novotny_2020,GRYAZNEVICH_2020,}

%\include{bibliography}

%\bibliographystyle{unsrt}
%\bibliographystyle{apalike}
%\bibliography{/GW/root/bibtex/golem,/GW/root/bibtex/others}

\printbibliography[title={Contributions}]

%\printbibliography[title={The tokamak GOLEM bibliography}]

\end{document}