\documentclass{article}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{commath}
\usepackage{mathtools}
\usepackage{authblk}
\usepackage{filecontents}
\usepackage[
    backend=biber, style=numeric-comp, sortlocale=en_US,
    natbib=true, url=false, doi=true, eprint=false
]{biblatex}
\addbibresource{mybib.bib}

% ATTENTION:
%
% Do not add packages or use custom macros.
%
% Please only edit title, authors/affiliation, bibliography (optional), and abstract.
%
% Make sure this file builds with 'latexmk -pdf abstract.tex'

\title{Title of your talk}

\author[1,2]{Don Joe}
\author[1]{Smith K.}

\affil[1]{Uni 1}
\affil[2]{Uni 2}

\date{}

% Add you bib items here:
\begin{filecontents}{mybib.bib}
@misc{pub123,
	title = {Title of reference},
	author = {Mustermann, Max},
}
\end{filecontents}

\begin{document}
  \maketitle
  \begin{abstract}
    Your abstract goes here \cite{pub123}.
  \end{abstract}
  \printbibliography
\end{document}