@Article{513136,
     author = "Paulina Szyja",
     title = "Energy efficiency in the European Union and in Poland",
     year =  2016,
     volume =  44,
     number =  1,
     journal =  Studia i Prace Wydziału Nauk Ekonomicznych i Zarządzania,
     pages =  s. 267-277,
    }