@article{balitskiy2016energy,
  title = {Energy efficiency and natural gas consumption in the context of economic development in the European Union}
  author = {Balitskiy, Sergey; Bilan, Yuriy; Strielkowski, Wadim; Štreimikienė, Dalia},
  journal = {Renewable and Sustainable Energy Reviews},
  doi = {j.rser.2015.10.053},
  year = {2016}
}