@misc{Gajdka_Jerzy._Output,
 author={Gajdka, Jerzy. and Pietraszewski, Piotr.},
 howpublished={online},
 publisher={Wydawnictwo UMCS},
 language={eng},
 type={artykuł},
 title={Output and expected returns in Central and Eastern European countries},
 keywords={ekonomia},
}