@Article{2880,
     author = "Justyna Weltrowska, Barbara Konecka-Szydłowska",
     title = "Population changes in the towns of Wielkopolskie voivodeship ",
     year =  2006,
     volume =  ,
     number =  5,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 21-32,
    }