@Article{206737,
     author = "Tomasz Chaberko, Anna Fedirko, Paweł Kretowicz",
     title = "Social and spatial dimensions of demographic processes in Beijing municipality at the turn of the 21st century ",
     year =  2011,
     volume =  ,
     number =  16,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 5-19,
    }