@InProceedings{Ka¼mierczak-Piwko:2019,
  author  = "L. Ka¼mierczak-Piwko and G. Ganczewski",
  title       = "Energy Mix of Selected EU Countries and Ecological Competitiveness of Their Economies in the Area of Production",
  booktitle   = "Proceedings of the 33rd International Business Information Management Association Conference - IBIMA : Education Excellence and Innovation Management through Vision 2020; ISBN: 9780999855126",
  address     = "Granada, Hiszpania",
  publisher   = "Norristown, International Business Information Management Association (IBIMA)",
  pages       = "1911--1930",
  year        = "2019",
}