My code:
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\documentclass[a4paper,14pt]{article}
%\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
%\usepackage[english]{babel}
\usepackage{tikz}
\usepackage {amsmath}
\usepgflibrary{arrows} % LATEX and plain TEX and pure pgf
\usetikzlibrary{arrows} % LATEX and plain TEX when using Tik Z
\usepackage{amssymb,amsfonts,amsmath,enumerate,float}
\usepackage{color}
\usepackage{indentfirst}
\definecolor{green}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{mauve}{rgb}{0.58,0,0.82}
\definecolor{orange}{rgb}{1,0.5,0}
\usepackage{geometry}
\parindent=1cm
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{width=14cm, height = 9cm}
\usetikzlibrary{calc,intersections,through,backgrounds}
\tikzset{help lines/.style=very thin}
\linespread{1.0}
\begin{document}
\section{Section}
Hello! This is my test \cite{Blahut}! LaTeX is used for the communication and publication of scientific documents in many fields, including mathematics, physics, computer science, statistics, economics, and political science
\bibliographystyle{abbrv}
\bibliography{biblio}
\end{document}