@Article{247099,
     author = "Daniela Szymańska, Jadwiga Biegańska, Anna Gil",
     title = "Rural areas in Poland in the context of changes in population age structure in 1996, 2001 and 2006 ",
     year =  2009,
     volume =  ,
     number =  12,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 91-107,
    }