@Article{247111,
     author = "Jerzy J. Parysek, Lidia Mierzejewska",
     title = "Trajectories of the demographic development of Poland after 1989 ",
     year =  2012,
     volume =  ,
     number =  17,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 109-115,
    }