@misc{_Structural,
 howpublished={online},
 publisher={Statistical Office in Warsaw},
 language={eng},
 language={pol},
 title={Structural changes of groups of entities of the national economy in REGON register in Mazowieckie Voivodship in 2012},
 type={e-periodical},
 keywords={mazowieckie voivodship, statistical information, economic situation},
}