@Article{336734,
     author = "Barbara Jokiel, Barbara Miszewska, Michał Slenczek",
     title = "Structural changes in groups of employees in big cities in Poland, 1992-2001 ",
     year =  2005,
     volume =  ,
     number =  4,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 79-100,
    }