\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

\nocite{*}
%\include{bibliography}

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

\printbibliography[type=article,keyword=in,title={Official GOLEM Articles}]
\printbibliography[type=inproceedings,title={Conference proceedings}]
\printbibliography[keyword=mathesis,title={Master thesis}]
\printbibliography[keyword=bachproj,title={Bachelor projects}]
\printbibliography[type=misc,keyword=in, title={Miscellaneous}]
\printbibliography[type=article,keyword=out,title={Unofficial articles (without GOLEM cooperation/authors)}]

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

\end{document}