@Article{336730,
     author = "Krystian Heffner, Brygida Solga",
     title = "Foreign migration of Poles in scientific research at the turn of century ",
     year =  2008,
     volume =  ,
     number =  10,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 49-61,
    }