@Article{2876,
     author = "Elżbieta Sojka",
     title = "Process of ageing of Śląskie voivodship population until 2035 ",
     year =  2011,
     volume =  ,
     number =  16,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 121-138,
    }