@Article{488593,
     author = "Karol Kukuła",
     title = "Dynamics of producing renewable energy in Poland and EU-28 countries within the period of 2004-2012",
     year =  2015,
     volume =  15(23),
     number =  2,
     journal =  Folia Oeconomica Stetinensia,
     pages =  s. 167-176,
    }