@ARTICLE{Głodzik_Stanisław_Concentration_2006,
 author={Głodzik, Stanisław and Woźny, Tadeusz},
 number={No 4},
 pages={21-33},
 journal={Gospodarka Surowcami Mineralnymi - Mineral Resources Management},
 howpublished={online},
 year={2006},
 publisher={Komitet Zrównoważonej Gospodarki Surowcami Mineralnymi PAN},
 publisher={Instytut Gospodarki Surowcami Mineralnymi i Energią PAN},
 abstract={The paper investigates the growing concentration of coal production in the Polish mining sector in the years 1993-2005 in collieries belonging to the Coal Corporation S.A. revealing improvement of productivity both in terms of overall productivity and productivity of underground operations.},
 title={Concentration of coal production and productivity in the Polish mining sector in the years 1993-2005},
 type={Article},
 URL={http://czasopisma.pan.pl/Content/133787/PDF/5_GSM_22_4_2006_Glodzik.pdf},
 keywords={Coal mining sector, concentration of production, productivity},
}