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I have to start by saying that I am a newbie to LaTeX.

I chose the ArsClassica style for my master thesis, so I downloaded the LaTeX file of the ArsClassica guide from here and went on using this document structure without problems. ArsClassica uses the bibliography style philosophy-modern, but I would like to have something like numeric or ieee, but every time I try to modify it I get an error in the file biblatex2.sty at the command \blx@processoptions. How can I solve this?

edit: The example file loads: \usepackage[style=philosophy-modern,hyperref,square,natbib]{biblatex}

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    Welcome to TeX.SX! I can see nowhere in arsclassica.sty that it forces use of biblatex. Can you show a minimal working example (MWE)? – egreg Oct 23 '15 at 10:33
  • @egreg: The example file arsclassica.tex loads \usepackage[style=philosophy-modern,hyperref,square,natbib]{biblatex}. – Ulrike Fischer Oct 23 '15 at 11:03
  • Remove also the square option in the biblatex options. It is specific to philosophy-modern. – Ulrike Fischer Oct 23 '15 at 11:06
  • @UlrikeFischer It's sufficient to remove that and substitute with \usepackage{natbib}, choosing an appropriate bib style. There's nothing in arsclassica that depends on biblatex. – egreg Oct 23 '15 at 11:51
  • @egreg: I would never replace biblatex by natbib unless forced. A numeric style is the default with biblatex, and for ieee there is also a biblatex style. – Ulrike Fischer Oct 23 '15 at 11:57
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Remove the square option in the biblatex options. It is specific to the style philosophy-modern.

You could have found the source for error quite easily simply by looking at the log-file. It tells you that it doesn't like square:

! Package keyval Error: square undefined.

See the keyval package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.10997 \blx@processoptions
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The example file bundled with arsclassica is

\documentclass[10pt,a4paper,twoside,openright,titlepage,fleqn,%
               headinclude,,footinclude,BCOR5mm,%
               numbers=noenddot,cleardoublepage=empty,%
               tablecaptionabove]{scrreprt}

\usepackage[italian,american]{babel}
\usepackage[applemac]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath,amssymb,amsthm}
\usepackage{varioref}
\usepackage[style=philosophy-modern,hyperref,square,natbib]{biblatex}
\usepackage{chngpage}
\usepackage{calc}
\usepackage{listings}
\usepackage{graphicx}
\usepackage{subfig}
\usepackage{multicol}
\usepackage{makeidx}
\usepackage{fixltx2e}
\usepackage{relsize}
\usepackage{lipsum}
\usepackage[eulerchapternumbers,subfig,beramono,eulermath,pdfspacing,listings]{classicthesis}
\usepackage{arsclassica}

\input{arsclassica-settings}

\begin{document}
\pagenumbering{roman}
\pagestyle{plain}
%******************************************************************
% Frontmatter
%******************************************************************
\input{FrontBackMatter/Titlepage}
\input{FrontBackMatter/Titleback}
\clearpage
\input{FrontBackMatter/Abstract+Sommario}
\input{FrontBackMatter/Acknowledgements}
\pagestyle{scrheadings} 
\clearpage
\input{FrontBackMatter/Contents}
\cleardoublepage
%******************************************************************
% Mainmatter
%******************************************************************
\pagenumbering{arabic}
\input{Chapters/Fundamentals}
\input{Chapters/Code}
% *****************************************************************
% Backmatter
%******************************************************************
\clearpage
\input{FrontBackMatter/Bibliography}
\clearpage
\input{FrontBackMatter/Index}
\end{document}

There is no need to load all these packages; they're loaded here just for building the example document.

You just need

\documentclass[
  10pt,
  a4paper,
  twoside,
  openright,
  titlepage,
  fleqn,
  headinclude,
  footinclude,
  BCOR5mm,
  numbers=noenddot,
  cleardoublepage=empty,
  tablecaptionabove,
]{scrreprt}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc} % or whatever encoding
\usepackage[ngerman]{babel} % or whatever language

\usepackage[
  eulerchapternumbers,
  %subfig,% uncomment if you load subfig
  beramono,
  eulermath,
  pdfspacing,
  %listings,% uncomment if you load listings
]{classicthesis}
\usepackage{arsclassica}

In particular you're free to use the bibliography management you like, for example

\usepackage[numbers]{natbib}
\bibliographystyle{IEEEtran}

There is also no need to organize the directories in the exact way Lorenzo Pantieri likes. Use your preferred method.

Note that an IEEE compliant style is available also for biblatex: do

\usepackage[style=ieee]{biblatex}

for it (without calling natbib and \bibliographystyle{IEEEtran}, of course).

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