@article{sio_fe_al_fe_al_sio_so_sio_+al_mgo+fe_et al., 
  title={Chemical Composition of Coal Ash of "Progress" Mine ("TOREZANTRATSIT" SHC) Chemical Composition of Ash in h 8 Seam}, 
  abstractNote={are prevailing oxides within coal ash. Total oxide content (Fe 2 O 3 + Al 2 O 3 + CaO) is 4.11 within h 8 seam coal, and 8.61 within h 7 one. Against aluminosilicate oxides to basic ones SiO 2 + Al 2 O 3 /MgO + Fe 2 O 3 + CaO (it is 1.35 on h 8 seam, and 3.74 on h 7 one) the ash is acidic. Ash calcium is 6.73 on h 8 seam, and 3.27 on h 7 seam.}, 
  author={Sio and Fe and Al and Fe and Al and Sio and So and Sio and +al and Mgo+fe and et al.}
  }