@article{stec_rzeszowska_2019, 
  title={Innovative activity of Polish enterprises from the energy industry 2005 to 2017}, 
  DOI={10.25312/2391-5129.28/2019_02ss}, 
  number={28}, 
  publisher={Akademia Humanistyczno-Ekonomiczna w Lodzi}, 
  author={Stec, Sławomir and Rzeszowska}, 
  year={2019}, 
  month={Nov}
  }