%%% --- DO NOT MODIFY (BEGIN) ---
\documentclass[11pt,a4paper,oneside]{article}
\usepackage[T1]{fontenc}    % proper font encoding (hyphenation, copy/paste)
\usepackage[utf8]{inputenc} % UTF-8 source encoding
\usepackage{microtype} % micro-typographic enhancements for better text appearance

\usepackage[
  top=30mm,
  bottom=30mm,
  left=20mm,
  right=20mm
]{geometry} % page margin settings

\usepackage{amsmath}  % improved mathematical typesetting
\usepackage{amssymb}  % additional mathematical symbols
\usepackage[version=4]{mhchem} % chemical formulae and reactions

\usepackage{units} % unit typesetting; exa $\unit{25}{mm^2}$
% \usepackage{graphicx} % figures not used in the abstract
\usepackage[hidelinks]{hyperref} % clickable links without colored boxes

\usepackage{titlesec} % section formatting (keeps \section*)
\titleformat{\section}{\fontsize{12}{14}\selectfont\bfseries}{}{0pt}{}
\titlespacing*{\section}{0pt}{6pt}{3pt}

\makeatletter
\renewcommand{\maketitle}{
  \begin{center}
    {\fontsize{14}{16}\selectfont\bfseries \@title \par}
    \vspace{4pt}
    {\fontsize{12}{14}\selectfont \@author \par}
  \end{center}
  \vspace{6pt}
}

\makeatother

\usepackage{indentfirst}
\setlength{\parindent}{20pt}
\newcommand{\doi}[1]{\href{https://doi.org/#1}{DOI: #1}}

\pagestyle{empty}

%%% --- DO NOT MODIFY (END) ---

\title{\bfseries Title of the abstract}
\author{First A. Author$^{1}$, Second B. Author$^{2}$, Third C. Author$^{1}$\\
\small $^{1}$Affiliation 1, City, Country\\
\small $^{2}$Affiliation 2, City, Country\\
\small \texttt{corresponding.author@email}}

\begin{document}
\maketitle

\section*{Abstract}
The title and abstract text, with a~recommended length of approximately 1500--2000 characters, should provide a~clear description of the topic, the main contribution, and the novelty of the proposed conference presentation.

Abstracts must be written in English, fit on a single formatted page, and be submitted by the abstract submission deadline. This {\LaTeX} file must be used as the template for preparing the contribution and must not be modified; the predefined font size ($\unit[10]{pt}$), margins, and spacing must be preserved. For preparing the abstract, authors may find it convenient to use a web-based {\LaTeX} editing environment (e.g. \href{https://www.overleaf.com/}{Overleaf}), which does not require any local installation.

The following recommendations should be considered when preparing the abstract:
\begin{itemize}
  \item Due to the strict one-page limit, the inclusion of figures or tables is not recommended.
  \item The abstract should be written as a single, compact block of text, without further subdivision into sections or subsections.
  \item The text should focus on the core idea, methodology, and main contribution, avoiding excessive background or general statements.
  \item Author names should be given without academic titles; affiliations and addresses should be provided separately.
  \item Abbreviations should be defined at their first occurrence in the text.
  \item The use of clear and concise language is encouraged to ensure readability for a broad technical audience.
\end{itemize}

References to conference papers \cite{ref1} and journal articles \cite{ref2} should be listed at the end of the paper under the heading \textbf{References}, in the order in which they are cited in the text. Typically, 1--3 references are sufficient for an abstract.

In case of any issues related to abstract typesetting, authors are encouraged to contact the organising committee.

\section*{Acknowledgment}
There is very appreciated a kind sponsorship of grants of agencies.

\begin{thebibliography}{99}
\bibitem{ref1} %conference paper
X. Author et al., In Proceedings Abbr. (year), \doi{10.14311/APP.2023.42.0094}
\bibitem{ref2} %article
Y. Author et al., Journal Abbr. (year), \doi{10.21014/acta\_imeko.v11i2.1220}
\end{thebibliography}

\end{document}