\begin{thebibliography}{}

\bibitem[{Brandenburg} et~al., 2011]{BKKMR11}
{Brandenburg}, A., {Kemel}, K., {Kleeorin}, N., {Mitra}, D., and
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\newblock {Detection of Negative Effective Magnetic Pressure Instability in
  Turbulence Simulations}.
\newblock {\em \apjl}, 740:L50.

\bibitem[{Kemel} et~al., 2012]{Kemel12b}
{Kemel}, K., {Brandenburg}, A., {Kleeorin}, N., {Mitra}, D., and
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\newblock {Spontaneous Formation of Magnetic Flux Concentrations in Stratified
  Turbulence}.
\newblock {\em \solphys}, 280:321--333.

\bibitem[{Kemel} et~al., 2013]{Kemel13a}
{Kemel}, K., {Brandenburg}, A., {Kleeorin}, N., {Mitra}, D., and
  {Rogachevskii}, I. (2013).
\newblock {Active Region Formation through the Negative Effective Magnetic
  Pressure Instability}.
\newblock {\em \solphys}, 287:293--313.

\bibitem[{Losada} et~al., 2013]{LBKR2013a}
{Losada}, I.~R., {Brandenburg}, A., {Kleeorin}, N., and {Rogachevskii}, I.
  (2013).
\newblock {Competition of rotation and stratification in flux concentrations}.
\newblock {\em \aap}, 556:A83.

\bibitem[{Losada} et~al., 2014]{LBKR2013b}
{Losada}, I.~R., {Brandenburg}, A., {Kleeorin}, N., and {Rogachevskii}, I.
  (2014).
\newblock {Magnetic flux concentrations in a polytropic atmosphere}.
\newblock {\em A\&A, in press, arXiv:1307.4945}.

\bibitem[{Warnecke} et~al., 2013]{WLBKR2013}
{Warnecke}, J., {Losada}, I.~R., {Brandenburg}, A., {Kleeorin}, N., and
  {Rogachevskii}, I. (2013).
\newblock {Bipolar magnetic structures driven by stratified turbulence with a
  coronal envelope}.
\newblock {\em \apjl}, 777:L37.

\end{thebibliography}
